(as) tough as nails

'Nam

Vietnam (usually in the context of the Vietnam war)

The use of agent orange in 'Nam had unexpected consequences beside the Communist takeover in Cambodia.

a person who does not need very many drinks to become intoxicated.

If your a cheap date I'd hate to see your parents at a bar.

keep quiet about it (possibly from the sound one makes when trying to speak with closed lips, Attributed to William Shakespeare)

1. something, especially a low-budget movie, show, or book which achieves or is likely to become a success

2. a sleeping pill or sedative

Ill bet my boots she's a sleeper.

quickly and repeatedly switching from one thing to another

Those kids tell tales of musical jobs when they never worked in their lives.

a extremely confusing situation (from a comparison to a chaotic session of group sex)

Man, I don't think I've ever seen such a cluster fuck in hospital setting in my years of visting mom in the ER after she had a seizure.