(Verb) A term used to describe the action of doing the raunchiest, filthiest, most disgusting acts of sex imaginable. The 110/100 on the disgusting scale. The magnum-opus of dirty sex.
Man 1: "So then I stuck my ball-sack in her shit-stained ass while she moaned for more of it! Then I pissed all over her!"

Man 2: "You were Bustin' a McNasty, weren't you?"

Man 1: "Hell yea bro!"

filthy disgusting shit stain piss slime anus raunchy shit stained balls mucus covered dick
by Pizzadick123 October 9, 2011
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something thats so ill that you would bust a cap 2 c it
ill ill da da da sick p her h pwn
when he made that jump it was ill mcnasty
by mike i lie October 4, 2006
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A horny mcfaggot that loves them booty shorts.
Yo NIGGERFAGGOT TYNDRA, IM FUCKING OFFICER MCNASTY AND YOU AREN'T FUCKING DOUCHE
by I AM A NIGGA May 31, 2011
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a great lyrical writer that can dominate wordplay while still getting the point or meaing across clearly
That guy, Kenny, is a Murk McNasty when it comes to writing song lyrics.
by Kuhlerblynd April 28, 2011
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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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Someone who decides to sleep with his buddies ex-girlfriend who currently works at McDonalds
Hey Man did you here about Chris?
Yah, he's totally being a Drew-McNasty!
by wangotango112 April 3, 2011
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