In Ispy he says "cunstubble."
There is a brief use of the N slur.
Strong language is part of Angry Kid's character and is heard in every episode. There are some uses of "Fuck" and "Shit", and many uses of British swears and slang terms such as "Bloody", "Bollocks", "Wanker", "Twat", "Bugger", etc.
The episode "Swearing" is exactly what it sounds like. Angry Kid says different profane terms and British slangs such as "Bugger", "Bum", "Tit", "Fuck", "Shit", etc. This angers his father and he says "Shit" back at him before beating him down with a newspaper. "Backwards Writing" has Angry Kid writing down that his dad is a twat mirrored, before getting slapped. "Tourette's" has Angry Kid is unable to control his swearing and says profane words in a fast way.