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used to refer to quick robbery by an aborigine in australia. usually in queensland.
'who robbed the house bruce?' "Dunno Sheila I was on the dunny but I saw a brown flash'
by tadge72 April 24, 2010
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In the oscillations between struggling not to shit and feeling perfectly fine (somewhat analogous to contractions during child birth), the brown flash is the temporary but dire need to take a shit. Often results in sweating, heavy breathing, and a clenching shut of the asshole to prevent shitflow.
After 2 hours of holding in a shit I was brown flashing incredibly hard. My feelings of intense need to shit were becoming closer and closer together and I knew if I did not shit soon I would ruin a pair of innocent underwear.
by IShitALot September 14, 2014
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