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1.
A nervous laugh, sometimes used if someone said something awkward.
Guy 1: Hey, I have this really good website for porn if you wanna check it out.

Guy 2: Aheh, no, I don't do that stuff.
by weesnaaaw April 25, 2010
 
2.
1. Confirmation 2. Agreement
A: "Who and how ya goin?"
B: "Duu... Not bad. You?"
A: "Lets go smoke a bowl!"
B: "A-heh!!!!"
by Duuuuu December 20, 2006