When you shit yourself with such force it goes through your underwear. The term is from when Bowser ass stomps like in Mario 3 when you defeat him by making him ass stomp through the blocks.
I sneezed so hard I let loose a trouser bowser. I tried to to lift way too much and a trouser bowser was released.
by Bokro June 18, 2014
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A discreet method for a male to give himself a quick wank inside of his trousers. Generally performed by masturbating the genitals with the hands placed in one or both of the pants pockets. Occurs commonly in public places or during work hours when open masturbation would be very problematic or one cannot move to private location for relief. Trouser Tugs generally do not reach full climax due to the mess and problems associated with the appearance of Trouser Gravy.
Dan was so horny at work sitting in his cubicle while on conference call. Since he couldn't leave the call to go to the men's room for a quick wank to blow his load, he chose to sit at his desk and give himself a Trouser Tug instead. He chose not to cream himself and blow Trouser Gravy as he had to meet with his boss after the call.
by Eaton Holgoode August 21, 2015
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When an attractive female makes you feel happy in the pants.
That bird was so cute, she gave me a trouser smile.

Her booty was so fine, I got a massive trouser smile.
by chilli sauce February 25, 2013
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mass pubic hair round the cock,taking on the apperence of a unkempt beard
must get my trouser beard trimmed
by martin70 March 18, 2009
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A Trouser Submarine is a large penis which is used to destroy male anuses and male anuses only.
Oh go harder man, I want you to use your Trouser Submarine on me and throw your sea men overboard into my anus
by batthule June 24, 2011
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A loud but musical breaking of wind, or fart.
"As a hush descended on the dinner room at Hogwarts, just as Dumbledor rose to speak a sudden sharp trouser trumpet honked into the air. Ron Weasley looked as red as a beetroot; In fact, it was Hermione who in typical muggle fashion had done it, but was willing to pass it on to Ron."
by D F Stuckey July 9, 2004
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