Word on the curb is that Kanye West threw an epic temper tantrum at the Neptunes studio this weekend.

According to one lil birdie, here's how it went down:

The Neptunes were working on a remix to their single "Everyone Nose" with a verse from Lupe Fiasco. All was going fine until Kanye enters and hears Lupe's verse, which was all too similar to one he had spit not long ago. Ye lost it, accusing Lupe of stealing/finishing his verse -- and that Lupe had the opportunity when he'd looked in Kanye's rhyme book previously. Everyone in the crowded room was laughing, thinking it was a joke, but Ye continued on, basically causing a massive, Naomi-worthy row and P had to calm everything down.

We're still fuzzy on how this was resolved but said source tells us all this hateration was part of the reason Lupe was in a rush to get his part of the concert over with yesterday.

As much as Kanye's little hissy fits annoy me to no end, I have to side with him on this one. I'd lose it too if someone was trying to bite my work. SMH. Didn't I say that including this dude in your group was gonna be trouble? Yes, I did. Almost five months ago.