It's pretty much impossible not to laugh at this -- Arnold Schwarzenegger completely losing his crap while trying to do the Nae Nae on TV ... and then taking it up a notch ... with the Stanky Legg.
Arnold and Joe Manganiello just appeared on BET's "106 & Park" to promote their new movie together -- and hosts Bow Wow and Keshia put the guys' dance moves to the test.
Joe's actually not that bad -- but Arnold ... you have to see this.
Busts Hilarious Dance Moves
Hasta La Vista, Nae Nae
3/27/2014 11:08 AM PDT BY TMZ STAFF
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