What is "skunked"

Usage examples of "skunked".

The stupid bastard made it back into the barracks without being found out, but he was still completely skunked when the training op started at oh-four-thirty.

You could make it, with your cat, but we'd probably get skunked again.

Can you imagine, clown, your girl friend was stupid enough to think we’d be pleased at her and even do something for her, after we’d kicked her out of the gang and she’d skunked on us to Billig?