Top Definition
The act of evenly distributing creamy Jif peanut butter all over your ball sack and having your dog slurp it off your nuts while you beat your cock like it owes you money.
Nick was rushed to the hospital after his dog mistakenly bit his nut clean out of his sack.. he clearly should have not been Jiffin it.
by Balls Deep369 March 30, 2009
1 more definition
10 Words related to Jiffin
found by freak accident at a game of scrabble.. meaning: really cool, class, mint etc

not to be confused with jaffa... which is however a really nice biscuit thing
wow your cartwheel was jiffin!
by liz August 04, 2004

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