1 definition by Aggyman Irie (yes langston)

Originating in Thornbury, Bristol. To Jimmy is to mong out, vomit, pass out, miss an opportunity, perform badly, or not make the most of a situation.

A Jimmy is someone who consistantly lets themselves or the team down by not possessing the skill, stamina, courage or drive to complete a task/fulfill a situation.
Kid A: "Yes blud, is Darren coming out tonight?"
Kid B: "Nah mate, he's a Jimmy"
by Aggyman Irie (yes langston) October 7, 2006
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