By Aly Semigran
Updated September 22, 2011 at 04:15 PM EDT

Well, it’s official: Nobody likes Mr. Schuester.

Especially not Jonah Hill, who all but declared war on Matthew Morrison, the actor who plays Glee‘s oft-maligned teacher/occasional rapper, during his visit to Late Night with Jimmy Fallon on Wednesday. The newly-svelte Moneyball star recalled a recent incident in which he attended a “douchey Hollywood party” where he tried to eavesdrop on a conversation between “Gossip Girl guy” Chace Crawford and Morrison, who had previously ridiculed him at a Fox television event (here’s that part of the story), only to hear that the Glee actor made a joke in which “Jonah Hill” was the uproarious punchline. It is on, PopWatchers.

Not only did Hill call Morrison out on national television with some flowery Sitter-like language (“Yo, Matthew Morrison, you better bring your s— next time I see you”), but he also earned some major street cred from the Roots (Questlove gave him a standing-O!). Check out the full clip below in which Hill draws the battle lines of this latest celebrity feud (“I’d like to see him sing his way out of this one!”).

Whose side are you on, PopWatchers, Jonah Hill or Matthew Morrison? Would you like to see a dance/sing-off between the two or a legit throw-down? Who would win?

Read more:

Jonah Hill on ‘Moneyball’ and being an underdog: ‘I was at the bottom of a list of other actors you’d expect to see in this part.’

‘Glee’ premiere ratings down 32 percent from last year. Why didn’t you watch?

Matthew Morrison cast in ‘What to Expect…’