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2 definitions by Justin W

 
1.
Wet substance remaining in the anus. Can be caused by lubricants, semen and even crap from a poopdick.
Roy had a yuckbutt after a pleasent evening with Troy.
by Justin W September 28, 2005
 
2.
Male version of the Camel Toe. When a mans pants are so tight it seperates his testicles individually from an outside view looks like a pair of Buck Knuckles. Also known as Moose Knuckles. Robert Plant is famous for his buck knuckles.
Either that Emo kid has a vagina, or hes flashing his buck knuckles.
by Justin W November 10, 2007