look up any word, like half chub:
 
9.
A burger from a guy in the McDonalds parking lot that has a load of cum on the meat
What the Fuck, he gave me a McNasty
by Bakken March 03, 2009
5 4
 
22.
the doing of sexual intercourse while on the roof of toys r us while giving your partner a texas chili bowl and singing old elvis songs

Cody Houck decided to go on the roof and mcnasty rebel
by Josh Chotta February 25, 2007
0 2
 
23.
when you force feed someone a big mac while raping them
he mcnastyed that trick ass bitch
by Lemony Petaphile June 02, 2008
12 16
 
24.
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.

by Bankruptcy Bitch November 06, 2006
6 11
 
25.
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.
by Kellaur August 23, 2006
6 11
 
26.
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.
by Kalaniiii June 29, 2006
2 7
 
27.
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.
by Miss McNasty July 13, 2006
3 9
 
28.
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!
by godde$$ April 29, 2005
58 64