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When someone takes something terrible and fixes it/makes it better (opposite of fucking something up).
You really Jim'd it up.

I just Jim'd up my car
by MrDarksideJim April 29, 2013
To have the best possible hand pre & post flop in Texas Hold'em, only to lose the hand either on the turn or on the river by having someone call you with no pair or no draw.
Dealer: Shaun moves all in

Dealer: Aaron calls

Dealer: Shaun has A/Q for top two pair

Dealer: Aaron has jack high, with a back door flush possibility

Dealer: Aaron wins, with runner runner flush.

Shaun: I just got Jim'd
by S. Havlin January 13, 2010