a jimmy Share definition Flag a one night stand gone wrong; horrible sex with someone you never want to see again I picked up a guy at the bar last night and he was a Jimmy! I called a cab before he woke up! a jimmy by Mandy Pavlov October 21, 2012 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug