Usually happens during surprise anal, when a woman has not evacuated their bowels properly. You usually get a five second warning after you mash a turd with your meat stick. Then suddenly, she needs to shit, so you pull out and the tip of your penis is wearing a top hat made of poo.
"After Katie gave me a chocolate top hat, life was not the same. No amount of soap can ever clean me. I might as well throw my dick out."
Pillowtop is a group of immature teenage boys who think they're cool and a transetter but in reality they really just don't know how to be a decent person and could care less about anyone about anyone. They're shady and shitty, and will more than likely cheat on you.
A knappy top is:
1. When a guy uses a twister on his head hair to make it into little spirals
2. A Hairy and Knotted up vagina
1. You see his Knappy Top! Must of used a Tornado Sponge
2. When I went down on her last night, she pulled down her panties and all I saw was her Knappy Top