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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 til he southbilled that motherfucker.
Southbill by Silva2022 May 21, 2009
Verb: to turn one's baseball cap 180 degrees, so that the bill is in the back, thereby showing how serious one is about whatever they are about to do.
"I thought that nigga was bluffin' till he southbilled on me. Nigga pulls a southbill, you KNOW shit be goin' down."

~The Dutchess of York
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 knew some shit was about to go down when Ash southbilled his hat
Southbill by BillyTheMudkip May 20, 2009
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.
southbill by SjHawkins May 21, 2009
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."
southbill by anoonamoos May 21, 2009
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.
southbill by j-stroy May 20, 2009