I'm with VL, literally means hurry up, stop pansy assing around and turn that muther! It is getting used more often, especially with reference to runways as traffic increases. Might not be used just in relation to traffic, sometimes use it when pilots need to tighten up a turn to avoid restricted airspace.
Saying all this though, you shoot yourself in the foot using it with Eastern European gents, ".....er.......say again"
FT