Top definition
A heroin user who smacks his sack to make a vein rise so that he can shoot up through his scrotum.
Dude, my parole officer is going to check my cock for trackmarks, but he won't look down under.

I guess I'll have to be Pat MaBalls.
by billyboyJLDS August 10, 2009
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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