look up any word, like bukkake:
 
2.
means to thoroughly take someone to task
Brian was spreading false information behind Mark's back, Jared told Mark about Brian then went back to Brian and said " Mark is going to clean your clock!"
by urbal February 23, 2011
 
1.
A slang phrase meaning to strike a blow to the face, where someone's face is their 'clock'.
Steve: Wow john, you blew it there.
John: Oh shut up, or I'll clean your clock.
by Super Cru (C-Baller) September 19, 2008