Top definition
Basically just you're phone number.. but usually said in a rude way or when you're mad. Meaning like the number ain't jack, who the fuck cares..
"Whatever ma, I didn't give no one your jack number.. I'm off this."

or

"Fuck you nigga. You gonna keep sayin that shit then just delete my jack number."
by kk.michelle November 21, 2012
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