A phrase used when you see a very hot female/ male (depending on if you are gay are straight as a gate) Well anyways back to the def, you start getting an erection and its just getting bigger and bigger and bigger, and all of the sudden you hear a "rip". and you notice that you boxers are ripped from your big ass boner.
"Omg did you see that hot guy... omg i think i have a trouser rouser."
by Slimslope May 11, 2006
a big hardon in your pants
every time she takes her top off it's a real trouser-rouser
by woodpile January 20, 2010

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