When a guy nails a chick in the ass and then she sucks his cock.
Guy 1: Dude, did you really give her a McNasty?

Guy 2: Hell yeah!
додав dafrog_05 16 Березня 2009
when you force feed someone a big mac while raping them
he mcnastyed that trick ass bitch
додав Lemony Petaphile 02 Червня 2008
1. An extremely ugly person who is stupid and annoys everyone around him. He usually asks dumb questions and pretends to have a girlfriend, who is usally ugly or underage.

2. Ugly boy who sleeps with blow up dolls.

3. Another name for Alex or Gomer.
Gomer's last name is McNasty.

Eeeww...McNasty asked Cristi out on a date? What about his girlfriend? I mean, blow up doll.

додав Bankruptcy Bitch 06 Листопада 2006
a male who smokes pot for a living and transmits the "McNastizzle" disease.
McNasty wants on me, but he wouldn't be able to get it up because he is too stoned.
додав Kellaur 23 Серпня 2006
1) derived from adding mc onto every word.
2) refers to a boyfriend who has weird habits, crab claws your chest or wont have sex with you even though he has no chance of getting laid.
3) someone who has bad acne and sort of looks like a gremlin because of it
1) The roadkill we just passed is mcnasty.
2) Mcnasty is coming over but we wont DO anything.
3) I got put on this cream because my face was mcnasty.
додав Kalaniiii 29 Червня 2006
An extremely rancid, bloated, overweight and unkempt person--especially one who has the odor of decayed feces even after exhaustive bathing.
Scott is such a McNasty I doubt he will get hired after his time is up!
додав godde$$ 29 Квітня 2005
Usually a pretty girl, but also tends to be visably crazy. Usually spotted in North Beach; does not F*&@ with roofies as they are real and not a joke.
She is a real live person, that McNasty.
додав Miss McNasty 13 Липня 2006

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