Something or someone of exceptionally high quality, most commonly spoken from the mouth of a gator. (See definition for gator- i.e. "best pimp in the game")
Chris: How was banging that chick last night?
Christian: I meannnn, the bitch was gatorgrade. Came 4 times.
Christian: I meannnn, the bitch was gatorgrade. Came 4 times.
by FreshN'Moist June 10, 2013