As far as "bustering," I got that very term from the TACRON just a couple weeks ago to return for a medevac.
I've heard it more than once from controlling E-2 and even the Air Boss in conjunction with "Charlie". Every time, it was either to forget about max conserve in order to get to assigned station (ie for a Tu-95 Bear intercept) or "bak ship" for a ready deck. "Never heard "gate" though.