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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When a man dips his dick into a jar of Big Mac sauce and has a girl suck on it.
Rodger- What did you do after your shift last night?
Trevor- I stole a some Big Mac sauce and gave Rachel a Super McNasty.
by Wwane Dade January 22, 2012
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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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It's when you lick a clump of feces out of a girl's anus then spit it on to her breasts in a decorative fashion. Then you lick it all up and throw it back up in her anus.
"Performing a mcnasty shizzgrizzle is just M. Night Shamylan making The Village...a betrayal to all normalcy this world has ever known"
by Snoop Diggity D January 24, 2008
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Any person having an extremely great time at a party or event would be known as having a Blasty McNasty.

A heightened sense of crunk.
I had a Blasty McNasty at the party last night.

My birthday was a Blasty McNasty.
by coffeesamuri February 2, 2010
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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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