so there are two football clubs in the city I went to uni in and their fans have... interesting ways of insulting each other which have kinda gone viral (to the point of there being merch with them being sold 'xD)

translation: ŁKS (one of the clubs) jokes about serious topics

translation: Widzew (the other club) wears turnip shoes!!! (it sounds similair to Velcro shoes "buty na rzepy")
response: We can afford them
! -And you wear sandals and a sock!

translation: RTS (another name for Widzew, I think... 'xD) thinks that perm means dipping head in plaster

translation: ŁKS thinks that in vitro is a pizza place

translation: ŁKS mystakes Reksio (character from old Polish cartoons) for Krtek (character from old Czech cartoons) (one is a dog, another is a mole)
there are many ways to be creative with your insults... 'xD