Top Definition
Bum - The obvious, ass, fanny (If you're american)

Fapper - Tossing off
Do the maths
Avalon Audrey: "Wow Chelly, isn't Jonjo the biggest bumfapper you've ever seen in your life?"

Chelsey Amelia: "He is indeed Avie!"
by bumfappers annonymous August 02, 2009
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