- See also: Fanfiction involving Heiman
The two characters are a key focus of the story arcs of Season 20, during which they became close friends, and eventually began a romantic relationship.
The pairing's origins can be traced back to Heidi's first speaking appearance (in which she was referred to as Marcy) in the episode "Probably", where she refused to leave Cartman's church with her parents and Cartman insists to her parents that she must stay to be "saved". In "Marjorine", Heidi acted somewhat of a Cartman of the female population, with some qualities reminiscent of Cartman's original 'Whiny' personality. This could possibly serve as a basis for a future bond for the two.
Most notably, Heidi and Cartman were paired together in the episode "Follow That Egg!" and seem to get along rather well, the only sign of displeasure being Heidi's moan of 'Awwww!' on being partnered with him. Also, Cartman pleads with Mrs. Garrison to change Heidi's grade to a well-deserved A and his to an F when he breaks his egg. Though he claims that this will cause their grade to average out to a C- for the both of them, he never voices why and he keeps his sincerity true.
They also sat together in "The Ungroundable", when Mr. Mackey was teaching computer lessons. This might indicate that they might still be close friends.
In Season 20, beginning in "Member Berries", Heidi is the first of the girls to accuse Cartman of being the sexually harassing troll Skankhunt42, but after continued bullying, she quits Twitter entirely. When Cartman is forcibly removed from social media and proven innocent, he and Heidi hang out together and bond over not using social media anymore. Heidi eventually apologizes to Cartman for accusing him and they become friends. When he expresses confusion about vaginas, she offers to show him one.
By the episode "Weiners Out", Heidi has shown Cartman her vagina (from six feet away and quickly) and they begin a romantic relationship as boyfriend and girlfriend. They use pet names like "babe" and "boo" for one another, hold hands, and both defend each other to Kyle Broflovski.
- Within the last few episodes of Season 20, primarily, "End Serialization," Cartman has noticeable tension after Kyle informed him about Heidi having the ability to see his posts on social media - specifically the one about the female actors "ruining" the new Ghost Busters movie, simply because they were "not funny" in a flashback - despite his stuff getting destroyed by Kyle and his other friends. This has him question his own feelings towards Heidi, even though he expresses jealously towards Butters.
- The tension grows stronger when he realizes that Heidi isn't funny; he even overtly wipes Heidi's kiss off of his cheek while she turns her back and walks towards her house.
Although this pairing is not popular as a main pairing for the focus of a fanfiction, it is often used in stories where Cartman's relationships are only touched upon or mentioned, and is generally a "throwaway pairing". It declined when Cartman was revealed to have attractions to men, but has since spiked back up since Season 20 canonized it. This pairing Often Rivals with "Kyman".
The Pairing has several fanfics.
|Big Gay Slave | Buttus | Candy | Catty | Clisa | Clybe | Creek | Garrislave | Grendy | Heiman | Ivenson | Katince | Kelley | Kybe | Kybecca | Macksondik | Nichyle | Philerine | Pipella | Revin | Stendy | Tenny | Tokendy | Tokole|
|Bed | Betters | Brendy | Bribe | Buttus | Candy | Cartbe | Cartenny | Catty | Clisa | Clybe | Cred | Crendy | Crizzy | Grendy | Heiman | Henerkle | Henriel | Ivenson | Kannie | Katince | Kebe | Kelley | Kenally | Kendy | Kevlly | Killie | Kybe | Kybecca | Kyndy | Lianed | Liartman | Loken | Lolutters | Macksondik | Mactoria | McDanbrady | Mutters | Nichyle | Philerine | Pindy | Pipella | Ran | Reboken | Revin | Rip | Roken | Sheopold | Sherry | Shyle | Sip | Slavendy | Stabe | Stanrietta | Stendy | Tannie | Tenny | Tokendy | Tokole | Twebe | Twebecca | Twendy | Wetters|