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The Ravens might not beat the Chiefs this weekend on the field ... but they'd WHOOP THAT ASS on the dance floor -- 'cause Baltimore's stars just showed all their moves, and they're insane!!!

Mark Ingram filmed the whole locker room party ... and it's the best few minutes of video you'll see all day.

The rug cutting begins with safety Tony Jefferson showing off some fancy footwork ... and then linebacker Matthew Judon and D-lineman Brandon Williams hop in the mix.

There's a tremendous rendition of the "Chicken Noodle Soup" dance ... and when the DJ switches tunes, there's even more greatness.

Hollywood Brown drops it low ... and Jefferson, who at some point took off his shirt for the party, shows off even crazier moves!!!

Seriously, it's all amazing.