I first heard this from a union negotiatior after a negotiation, so I innocently said to her, "Oh, you mean we're about to get fucked," which jibed with my reading of the situation. Surprisingly enough, this was not at all what she meant, and the saying was supposed to have absolutely no sexual connotation. It's a longshoreman's phrase meaning "get to work" - so it would normally be said by one super-straight sweaty guy to another. The woman's husband was a longshoreman (and she didn't care for queers), so I guess I can understand why she was so offended by my interpretation.