While wearing all black spandex pants, cut off shirt, and a sombrero, a person slowly walks up to someone and proceeds to try to make them self vomit by putting their finger down their throat.
Works best if the offender maintains silence and an expressionless face.
Once completed, the offender slowly walks to the next victim without acknowledging what they just did.
Aaron totally just pulled the Bulimic Chicken Chaser on those girls over there. It was balltacular.