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1.
a turd, poop, shit, duece, etc.
I gotta go, a brown snake is playin peek-a-boo with my butthole
by rmfp August 21, 2006
 
2.
The action of shitting into a condom, than using it as a dildo.
Something Heather Carey would use as a dildo.

"Hey, Look! Heather is working that brown snake."
by TMyspace2000 July 26, 2009
 
3.
Deadly venomous family of snakes found in Australia, particularly dangerous because of it's aggressive behaviour and wide habitat.
Strewth! I just stepped over a log and found a brown snake. Cranky bastard had a go at me too! It even chased me back a few metres before it slid off.

<OK, apologies for the gratuitous lingo.>
by Flex, Khan of Putnay September 23, 2006