Lil Wayne got so pissed during his High Times performance … he vowed to never return to the event, before storming off stage. Wayne was the headliner Saturday night at the Cannabis Concentrates Cup show in Southern California — and seemed to be feeling the crowd at first.

But watch the video, after just a couple songs … he went into a rant that, at first, just seemed like he was freestylin’. He topped it off with … “Don’t you ever, ever, ever ask me to do this s*** again!”

It’s unclear what set him off, but concertgoers say Weezy bolted after just 3 songs.

A rep for High Times tells TMZ they have, “no idea why Lil Wayne suddenly ended his performance after just four songs when he was contractually committed to performing for an hour for the fans.”

The rep adds all the other acts on the bill — including B.o.B. — performed as expected and the show was going well until Weezy got sour.

High Times says it’s baffled and still waiting for some explanation from Wayne’s team.

(Source –