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1.
Somebody who's clever, strong and handsome.

"Damn he's hot, must be an astill!"
by Mr.Xoooooooooo January 02, 2009
 
2.
Someone who fornicates with members of the same sex but insists he/she is of straight sexual orientation.
That astill kept hitting on me the whole time I was looking at his "girlfriend's" titties!
by Cheese Eater July 21, 2006