look up any word, like slope:
Bell end
A knobtip is the edge of a man's cock which his man fog will fizz out of when he finishes
Big dawg : yo son, that bitch do you good last night?

lil dawg : yeah nigga, that slut done had her tongue all over my knobtip

big dawg : good suckin bro
by TB James August 08, 2008