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1.
As in or of saying the term relating to the word "Oh!", as in surprise or astonishment.
Person 1: "I got a new car today!"
Person 2: "OACH!!"
by Rose March 14, 2005
 
2.
same as taint. term coming from socorro nm refering to the space between your nuts and ass hole
guy: your nuts itch or somethin man?
dude: no wa man it is my oach bro.
by george January 20, 2005