A mythical young man of rather dubious character.
We'd like to have you all join in with us on this one, and help us find the groove, by patting your feet, or popping your fingers, or clapping your hands, or shaking your heads, or shaking whatever else you want to shake... while we do a little thing we call "Filthy McNasty".
by godwallop July 24, 2006
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The perverted old mick in your neighborhood who ogles and fondles all the young girls.
Mummy, mummy! Filthy McNasty touched me on me privates!!!
by Booker T. Buttfuck October 2, 2003
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Meaning a skanky person. You wouldn't want to touch him/her with someone elses hands.
Hell naw bro, I wouldn't even touch that Filthy McNasty biotch with your dick. She's had everyone's cock up in her grill}.
by SexyGreenEyez February 8, 2005
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Moniker attributed to one who constantly uses coarse, obscene or graphic language when speaking.
Man "Why don't you like my brother?"

Wonam "Because he's a Filthy McNasty! He is so vulgar!"
by ingloriousone May 26, 2010
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In honor of the dearly depated ODB (aka: DIrt McGirt)
Filthy-McNasty is aka: Ol' Dirty Bastard and Dirt McGirt...
by Black Carrington January 22, 2005
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