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2.
A person whose mother/father is from the north of the Mason-Dixen line and whose mother/father is a coonass from Louisiana.
Sarah, a Yankass, has a mother from Louisiana and a father from Indiana.
by Sarah July 15, 2003
 
1.
Highly Skilled or Lucky move to win at a contest / game. Able to pull off an action purely by luck.
Did you see him pull that yank ass technique in World of Warcraft? I was sure he was gonna die!
by Rhimjob February 05, 2010