Definition from Wiktionary, the free dictionary
The phrase dates back to 1910 (US).
- (chiefly North America, slang, idiomatic) Forcible ejection from an establishment, as of a bum (hobo).
Related terms 
See also 
- Wikipedia article on Baumes rush - Although this has been suggested as a possible origin of the phrase, bum's rush was in use for more than a decade before Baume's Law was passed.