Top definition
A form of gay sex involving three men. Man A inserts his erect penis up Man B's urethra. Next, Man C inserts his erect penis up Man B's anus and into the urethra of Man A.

It's a urethra within a urethra within a urethra.
Gosh darn it, Edward sure loves it when him and his two friends engage in a rousing bout of triple urethral.
by Stiaznitch July 06, 2011
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