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.
by SjHawkins May 21, 2009
Get the southbillmug. "You could tell that nigga was serious when he southbilled his hat."
"Southbill your hat, it's go time."
"Southbill your hat, it's go time."
by anoonamoos May 21, 2009
Get the southbillmug. by j-stroy May 20, 2009
Get the southbillmug. by Rustingway May 21, 2009
Get the Southbillmug.