When an under-aged girl performs a BJ leaving her lips all crustylike an unwanted donut that when you see them you puke and die a little on the inside!!!
YO man, I just saw some skank with a fresh pair of crustylips!!!
a man who is described to be crusty with abnormally over larged butt lips. micropenis and gap teeth and choc-o-lat are normally side effects of the crusty butt lips syndrome.
john: dude, get some chap stick for your crusty butt lips.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi