When a person, either real or fictional, turns their baseball cap through 180 degrees so that the peak faces backwards to physically represent that they have switched into "go-time" mode.
I didn't think that nigga was serious till he southbilled that motherfucker.
by SjHawkins May 21, 2009
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To turn the hat 180 degrees to indicate that it is go-time or that shit is about to go down.
"You could tell that nigga was serious when he southbilled his hat."

"Southbill your hat, it's go time."
by anoonamoos May 21, 2009
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Baseball cap worn with the brim facing aft of the ears.
That chick that started the fight was wearing a spandex sports top and a southbill cap.
by j-stroy May 21, 2009
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To be on the receiving end of a shouthbilling.

If you get southbilled, you have been in some way mastered and/or dominated by a person or persons who recently performed the southbill manoeuvre.
Shit, homes. You just got southbilled hard by those motherfuckers.

We better get out of here! Than nigga just pulled a southbill - we're gonna get southbilled!
by Rollo.Cohen July 4, 2009
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