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1) Someone managing a feat of extreme fluke or percieved skill; such as winning a poker hand on the last card turned, bouncing a pool ball three times around the table, before deflecting it off the white into a pocket.

2) A sweet and tastey act of copulation involving fruit conserve, jam, or jelly being used as a lubricant, before the couple engage in a 69.
"You Jammy Fuck, how the hell did you make that shot?!"

"How do you fancy coming to mine for a jammy fuck tonight"
by Dr Insanity February 26, 2009
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