This is probably a joke but I'll answer anyway
By 'cheeks' they mean buttocks so by "making them clap" is referring to them being so big/thick that they clap or make noise when you walk or move around or something.
I probably got played lol but whatever
Answer:
I am pretty sure it's 2 and why does my answer have to be so long it won't let me submit so just ignore everything after the 2