A contest between two or more people to find who is the most black (even if some or all participents have white skin)
White man: I'm more black than you

Black man: No, you've got white skin.

Person 3: "BLACK OFF"
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My friend johnny really has a thing for black chicks, he bought a copy of hot chocolate magizine and a tube of vasoline at the conviance store and procided to imediatly go into the bathroom and black off.
by LMxDurgex December 25, 2008
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A slight variation on 'back off'.

When one of your white friends misappropriates black culture/slang to the point of annoyance on your part, you have the option of telling them to 'black off'.
Your friend: "Yo whatup my doggy nizzle"

Your response: "Black off"
by Tommoyo December 4, 2007
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"He went off with his other mates, he's a black off!"
by Dicky Brown September 26, 2007
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When you have drank so much alcohol that you are blacked out and decide to masturbate to no avail, and not being able to remember
I walked in Matty O's room last night and he was blacking off
by State O State October 17, 2008
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To masturbate whilst so terribly inebriated one experiences memory loss
billy: what does mr. idelpants do after a cocktail or six?

charles: he enjoys locking himself in his room so he can black off.
by the whirling dirvish April 24, 2010
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A white or caucasian person trying to act black
Hey did you see Jimmy? He is wearing some baggy pants, a flat brim hat, and some huge diamond earrings. Yeah I saw him, he was totally blacking off!
by stokley17 January 27, 2010
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