1. A bullying technique typically occurring in a high school or grade school where someone is forced into a toilet head first and held there as the toilet is flushed.
2. The process of stinking someone's head in the toilet and flushing, with the goal of leaving the victims hair in a swirl from the spinning toilet water.
1. Little Bobby was afraid to go into the school bathroom alone, last time he did a bunch of bullies gave him a swirly.
2. There is no worse embarrassment than walking down the halls of high school soaking wet post swirly.