The Dictionary of the Vulgar Tongue is an on-line hit, as it was when first published in 1811! 

Are you an elbow shaker? (A dice player.)

Is she a hempen widow? (A woman whose husband was hanged.)

Have you dirtied your inexpressibles? (Breeches.)

Delightful! For more of the best of the best, go here. To download the dictionary or read it on-line, go to Project Gutenberg.