To fluff shake is to diarhrea. It is a liquid form of a fluff. It is derived from the fact that when you diarhrea it looks like a messed up milk shake was poured into the toilet.
Man, that bean burrito I had yesterday sure gave me a bad case of the fluff shakes.

Oops! I just fluff shaked in my pants.
by Poopty puepty pants April 18, 2005
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