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1.
Yes sir, especially when responding with great enthusiasm. See yace.

The ah can be drawn out for especially strong situations, as in "ahhhhhhhh".
"Dude you bring the weed?"
"Yace-ah!"
"The good shit?"
"Yace-ahhhhhhhhhhhhh!"
by Joe Bone March 09, 2005

Words related to yace-ah

lay chili shit something you don't want yace