The kind of person who makes several metric asstons of jam every year, turns up unannounced at your house with carrier bags of full jam-jars, then "accidentally" leave those bags at your house even though you've flatly refused any more bleedin' jam (which you had to do because all your cupboards are full of jam from them doing the same last year, and you couldn't even shift it on to anyone else because all *their* cupboards are full of jam).

Original coinage by Johnny Defective (Norwich, United Kingdom)
"I love seeing Auntie Doris, but she's a total jam pusher. I went to visit her once and when I got home I found a jar of raspberry marmalade in my handbag."
by Shinydan August 10, 2014
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