To hang around the Pennsauken track team and have your colon ruptured by them several times. Also, to be hated by one's father simultaneously. In another sense, the colon the ruptred is ruptured by the Terminator - see "industrial steel colon".
Look at the douche, he's Jeffin' around (to jeff), he's gonna have to be in the hospital for a rectal doctor for 3 months!
by dbsb May 12, 2011
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To commit an act, or several acts of delinquency and debauchery.
"Did you see Jeff down 30 beers and try to do a kickflip?"

"Yeah man he was totally jeffin' around."
by Kriegboi July 2, 2018
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