When Shipping a pair of characters, fans often combine the characters' names into a portmanteau word. They then use this word to refer to the couple as a unit.
Although more common in anime fandoms, where the syllable-based nature of the Japanese language means names are modular and can be snapped together with ease, there are still numerous examples of South Park pairings where this happens.
The South Park fandom seems to favor ship names that can be actual words: Style (Stan/Kyle), Bunny (Butters/Kenny), Creek (Craig/Tweek), Candy (Cartman/Wendy), Dip (Pip/Damien), Cutters (Cartman/Butters). Most of the rest are silly portmanteau names (for example, Kyman for Kyle/Cartman, Stendy for Stan/Wendy) or simply the name-slash-name format.