Alligators or crocodiles in general.

People who install or operate gates.

Enthusiasts of the sport "gater" (watercraft).

Slang for gatekeepers, controlling access to information/events.

A term used in gaming communities for players specializing as defenders at entrances/exits.

To move stealthily or sneak up on someone.

To be aggressive or confrontational in behavior.

To lie low and wait for an opportunity.

To act coolly, maintaining a tough demeanor.

To eat voraciously or with enthusiasm like an alligator.