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1.
When one uses a towel to wipe after defecating, not out of necessity, but personal preference.

Typically denied by some who claim the towels are used for sex.
"Why do you use so many towels?"

"For post-coital cleanup."

"Yeah right, you're using brown towels."
by the filthy hebrew December 08, 2009
7 2
 
2.
Masturbation, in which your result ends up on a towel, preferrably brown in color, for visual purposes.
Who's leaving these brown towels in the bathroom?

Don't Brown Towel in there!
by spongedick December 06, 2009
5 6