When the automatic bathroom stall flushers flush every time you slightly shift your weight, even though you haven't finished yet, causing gross water to splash up.
Guy1: Dude? Why did you flush so much?
Guy2: The stall had a hair trigger flush and it kept splashing shit water on me.
Guy2: The stall had a hair trigger flush and it kept splashing shit water on me.
by calvinke April 2, 2010
Get the Hair Trigger Flushmug.