Just bustin' ya chops!
After you want to make a joke and trick somebody, You say "EH! Just bustin' ya chops"
Person 1: Hey, Did you know you have a fly on your face!
Person 2: What! GET IT OFF!!!
Person 1: EH! Just bustin' ya chops! (LOL)
Person 2: What! GET IT OFF!!!
Person 1: EH! Just bustin' ya chops! (LOL)