Similar to Hell yes or Heck ya but a valley girl or nerdy way of expression often used to try to sound cool ..using your index finger to indicate a check mark.
Guy: Hey are you going to the party on Saturday there will be tons of booze.
Drunk girl:I cant wait...CHECK YA!
Drunk girl:I cant wait...CHECK YA!
by Missbsexi August 07, 2009
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