I'm Spartacus! 

A movie quote where the law demanded a crowd to bring forth Spartacus (who had just fucked some shit up) and everyone began to claim to be Spartacus cause no one wanted to be a snitch bitch.

In modern terms, to claim ownership of an act that has legitimately pissed someone off in hopes of deescalating the situation or can also be used to further enrage the person. Works best when other friends join in.

*during huge party at Tom's house*

Tom: EVERYONE SHUT UP *music stops* Who the fuck put a dent in the bathroom wall!?

*a few seconds of silence pass*

Josh:... I'm Spartacus
Bill:.... No I'm Spartacus!
Ray: NO I'M SPARTACUS!
*bunch of other bros chime in claiming to be Spartacus*

Tom - EVERYBODY GET THE FUCK OUT!

I'm Spartacus! by I'm Spartacus November 21, 2010