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2.
When toast or other cooked food begins to become brown across the entire top of it, and you know it's perfectly toasted.
Has dinner commenced Brownian Motion?
by DellPaxton July 20, 2011
 
1.
The random growling noises caused by the gut that warn the growlee a bathroom visit is imminent.
Colleague: "Jesus, that sounded like a tank driving past."

Growlee: "Actually that's just some Brownian Motion going down. I'm a ticking time bomb."
by RhythmJunky May 10, 2009
 
3.
The act of performing a Brown-eye whilst in a cartwheel.
That was some crazy brownian motion... he got the whole crowd...i cant believe he could cartwheel the whole field naked
by Lincz October 18, 2006