Female masturbating, i.e, the female equivilent of jacking off. Originates from the lyrics of a once-popular hip-hop song by the group OutKast called "Caroline". Widely used by high school/college students on Chicago's North Shore. Variations: trig off, trig yourself, triggering, trig
-"Why is Cindy so fucking happy today? Her boyfriend dumped her just last week!"
-"Looks like someone's been trigging off in the supply closet again...!"
"Susie's boyfriend was terrible in bed. She had to trig off every time just to come!"
3. noun (insult)
-"Why, hello Susie. Apparently you're a whorey trig. And how's your mother?"