Lickknob 

Some so dumb they can't even get the simplest things right.

Hey, Don. Lickknob is one word!

Lickknob by Jeremy December 4, 2003

licknob 

A. A person that is an asshole, prick, or generally disliked. B. When a female performs oral on the male genetalia.

A. That smelly guy that stole my money is a real licknob. B. That slut has licknob skills unsurpassed by anyone.

licknob by K.G.#1 July 16, 2008

LICKNOB 

Slang for a person who prefers fellatio.
An undesirable personality.

That gurl's/guy's a straight-up Licknob.
What's yer problem, you freakin' Licknob!

LICKNOB by BigRick October 19, 2006