When a male puts a penis In a girls butt And then takes a shit at the same time.
"Oh man i just did the dirty gus"
"Dirty Gus! ohh man i feel 10 pounds lighter!"
by chris finethy September 10, 2006
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During sexual intercourse, in doggy-style position, you insert your finger in the girl(or guy's) ass hole and get your shitty finger and write "gu" on his/her back.
"that fuckin dirty gu hit the spot last night"
by andrelovesgu March 25, 2008
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