Someone's hand when they are trying to imitate a gun by making a fist, sticking one thumb in the air and pointing the index finger forward. Hand guns are frequently associated with ice grilling and mock shootings.
One who posts a deliberately provocative message to the comments section of a weblog. Trolls often make outrageous statements not related to the subject being discussed, use fake names (and alternate between their handles in order to cause further confusion). They also known to slander Kyle's mom.
"Dick", "Tech-9" and "Real Ultimate Fascism" were some of the greatest trolls of all time.