TOUGH CROWD on spring break this year -- singer Jeremih took the stage for a special performance in Texas Wednesday night ... and when the crowd realized he was lip-syncing, they BOMBARDED him with drinks ... driving him offstage.
It all went down at Clayton's Bar and Grill on South Padre Island -- sources tell TMZ, the crowd was already pissed because Jeremih was two hours late to the show ... and when they discovered he wasn't even singing, they went off the rails.
Jeremih opened his set by "singing" his song "Down on Me" -- he barely got started before the crowd drowned him out with boo's ... and someone tossed a bottle.
Jeremih powered on -- but then some jackass throws a full drink at the guy, dousing him in a disgusting spring break cocktail, and J calls it quits ... walking offstage.
All in all, we're told the concert barely lasted a few minutes -- and the bar ain't refunding the $30 tickets. Calls to Jeremih's camp were not returned.