Stands for "Trolling in real life". It is harder than online trolling because you might actually get your ass kicked.

A list of professional IRL Trolls:
-Andy Kaufman
-Jonathan Swift
-Ann Coulter
-Otakus
-Barry Humphries
-Chris Morris
-Bill O'Reilly
-Dom Joly
-God
-Howard Stern
-Ted Rall
-The Runaway Bride
-Jeremy Beadle
-Ayn Rand
-Hurricane Katrina
-Jesus
-Tucker Carlson
-Anal Cunt
-Michael Moore
-Perverted-Justice
-Socrates

to Troll in real life is to yell, or taunt someone usually done in Troll Patrol fashion when your friend is driving and your yelling out the window.