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:
Oboe :)
Explanation:
Hieroglyphics
me
his music helped me when i was going through a very rough time and I can relate to alot of his music .