Top Definition
A brown tunnel is when a girl takes a shit then forces it into her vagina using her hands then gets a guy to plow her getting brown balls , variants include licking it out and shit swapping. The shit acts as lube for a very pleasurable experience.

Also called brown flume.
hey babe, ready for a brown tunnel? yeah i love brown balls, yummy
by browntown2 January 09, 2011

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