1. A male, often a slight odd-ball or creep, who has an insatiable lust for the female bottom which goes way past perverted and borders on psychotic. Often lurks in bushes or back-alleys and pounces when least expected to grab that ass!

2. A man who enjoys simulating the "bumming" action behind a woman when she has bent over for some reason.
Dale: Umm, excuse me Janine, you seem to have dropped your purse.

Janine: Oh, so I have, your such a nice guy Dale (proceeds to bend down and retrieve it)

Dale: Giggidy (performs the bumming motion)

Gary: You are such a bum fiend...
by RspecksW June 01, 2010

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