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!
作者 dafrog_05 2009年3月16日
when you force feed someone a big mac while raping them
he mcnastyed that trick ass bitch
作者 Lemony Petaphile 2008年6月02日
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.

作者 Bankruptcy Bitch 2006年11月06日
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.
作者 Kellaur 2006年8月23日
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.
作者 Kalaniiii 2006年6月29日
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!
作者 godde$$ 2005年4月29日
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.
作者 Miss McNasty 2006年7月13日



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