This Bartender is a minor character in Leprechaun: In the Hood.
The only instance of the Bartender is in a nightclub when Mack Daddy O'Nasses runs in and ducks into the restroom, only to run from the room and out of the club with a missing finger.
The Bartender then spots the Leprechaun coming out of the restroom. Immediately not taking a liking to it, the Bartender tries to hit it with a microphone stand, but the Leprechaun uses its magic to hold him in place.
After spotting the stand in his hands, the Leprechaun grabs it, which proceeds to magically electrocute the Bartender to death. The Bartender then falls to the ground, with the electricity flowing into his eyes, turning them green, further cementing his death.