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To defecate heavily.

"oh man, my stomach has been cramping all day. I gotta bust a meat!..."
bust a meat

Mando: ...workin since 4am this morning then, I had to go to my other job at 12pm and I got out at like 8 o'clock tonight. But you get used to it.
SV: Yeah I gotta work 12 hours tomorrow.
Mando: ..... Ohh, you're gonna bust a me?
SV: Yeah me too, I gotta take a dump.... Wait, what?....
by ceejaysez October 15, 2008
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