A skanky cling-on who is always hanging on your boy. She uses your shit without asking and invites herself to everything.
That fucking twat waffle jammis took my magazine and wanted to bang my boyfriend in the tent.
by Brittney Lynn May 6, 2008
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In British English slang, particularly of north-west England this means 'lucky' or more accurately 'flukey'. It is usually applied to someone else who has just had a particular piece of outrageous or undeserved luck.

It is typically used with this meaning by young men and schoolboys throughout the north-west of England, not just Liverpool and Merseyside, but also Cheshire, etc. However, the usage can occur in other regions of England as well. It has been used to have this meaning throughout most of the period since at least the end of World War Two.
1. "Rooney fluffed the kick and then the ball ricocheted off the back of the defender's head into the net! The jammy bastard!"

2. Dave: "Hey, Gaz, you was late to class for the third time in a row, innit, how come you don't have detention?

Gaz: "Strickland was, like, too busy chewin' out some other sap and didn't notice, so I got away with it!"

Dave: "You jammy cunt!"
by Shakespeare's Plumber October 11, 2010
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Yo, don't point that jammie at me.
by Bigup May 22, 2005
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Jammies (N) // (Jam•ees) - An informal term, often used flirtatiously. Not to be confused with pajamas, pjs, or nightwear. Oftened the result of a rejection to a FaceTime call.
“Were you afraid I was going to see you in your jammies 😋”
by Mark S. Jammies Esquire March 20, 2019
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flukey,lucky,defying probability with outrageous good fortune
'That was a jammy pool shot', said the guy playing pool in Geraldton.
by Geraldton Dictionary March 15, 2005
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