Omarion -- Restaurant Karaoke ... To My OWN SONG!

There are two ways to look at the video we shot of Omarion last night ...

The first way to look at it ... It's VERY COOL that a bona fide R&B superstar went to a local Hollywood chicken wing restaurant on karaoke night and treated everyone to a live karaoke performance of his hit song "M.I.A."

The other way to look at it -- What a d-bag.

So, here's what happened ... Omarion hit up Big Wang's chicken joint in Hollywood last night ... and took the mic at the karaoke machine.

The performance was pretty damn good ... he's clearly talented. The people in the bar clearly enjoyed the performance.

But some people in the TMZ newsroom have a bit of a problem with the stunt ... saying it's pretty egotistical ... and sad ... to karaoke your own hit.