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When you stick one hand up someone's ass, then stick the other down their throat, you then link your hands, and have sex with their belly button.
Logan: Dude, Sarah totally let me Dirty Roger her!

Tyrone: Hmm, Gross.
by Logan O October 30, 2007
A drunk smelly janitor with a dirty sanchez looking mustache.
It looks like dirty Roger never showed up for work again, he must be drunk as usual.
by Lou Gifford June 22, 2006