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1.
to masterbate or ejaculate to black people
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 24, 2008
16 5
 
2.
When you masturbate while black out drunk. It's actually quite enjoyable.
Example of a blackoff:

Timothy, "Man after drinking two four lokos last night I blackedoff"

Maroney, "How did you know?"

Timothy, "Well, I woke up with my pants around my ankles and jizz all over my stomach."
by Arthur Rhodes December 04, 2010
8 1
 
3.
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"
4 0
 
4.
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
4 0
 
5.
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 04, 2007
9 8
 
6.
To go off with someone else.
"He went off with his other mates, he's a black off!"
by Dicky Brown September 26, 2007
4 11
 
7.
A black girl/woman with a fat ass.(booty).
look at that ass , so got a blackoff blud.
by KACI 7777jh June 24, 2005
9 26