Omarion Rips Wade Robson 'Maybe He Needs Some Extra Change'

5/8/2013 7:25 AM PDT

Wade Robson's new sexual abuse claim against Michael Jackson is just plain "whack" ... this according to Omarion, who tells TMZ he thinks Wade might be lying to make a quick buck.

The R&B superstar was out at Supperclub in Hollywood last night, when we broke the news to the singer about Wade's new allegation -- that MJ sexually abused him as a child.

"I can't believe that ... I  can't believe you would sue a dead man," Omarion said.

Omarion says Robson -- a hugely successful dance choreographer -- might simply be looking for a quick payday. O then goes on to defend MJ.

So, we gotta ask ...