As in instigator. Instigating posts made intentionally to piss you off. Not to be confused with trolls and their damn trolling, gator posts are done by someone PRETENDING to be against something. A gator touches a keyboard to push buttons for control of your mind or a thread.
Those "Justin Beiber is gay!" gator posts are from his biggestsecret admirers!
Rather than a straight and symmetrical rail of blow a "Gator Line" is best represented by the increasing and divergent width of an alligator's tail starting at the tip and proceeding to the more dangerous main body. Hence the increasing excitement and danger of the Gator line.
"After today's mess at work a bump nor a rail will hit the spot..tonight we are doing Gator lines boys"
A flip which is performed by grabbing onto the handrails of a city bus and somersaulting all the way over. This move is typically done on the late night bus routes at the University of Florida by drunk college students.
college student: "I'm about to do a gator flip in this bitch!!"
bus driver: "It's a long walk home"
college student: "I don't give a fuck!!"