the light, creamy sweat layer that accumulates on a man's testicles when they are in a heated environment, such as tighty-whities or tight sweatpants.
"Hey Justin, check out my bag butter - it's like Land-O-Lakes!"
by Johnathan Sia February 11, 2007
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Derogitory term used for a woman's breasts.
Look at her set of butter bags!
by Jeff Ross July 12, 2005
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Ingredients:

1/2 stick butter
One quart sandwich bag

Place 1/2 stick butter in bag...Place bag in microwave...heat to preference (recommend no more than 25 seconds).

Masturbate using butter bag.
Evan always ran back to the butter bag when his retarded, underage girlfriend was taken away by her parents.
by Stanky Mustache July 30, 2010
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