It was first coined in the hit movie Mean Girls, although unfortunately not by Lindsay Lohan as we all wished. This does not ruin the fun and frolic of the saying however, and nowadays it is seen as a good gesture to use this phrase whenever you see fit.
2) Boo Whore! - as a threat
3) Boo Whore... - as a way of expressing ones tears
4) Boo Whore! - as a way of shooing off unwanted ethnics
5) Boo whore? - as a way of questioning God almighty