Jimmy Fallon Salivating Over Giancarlo Stanton Joining Yankees

Jimmy Fallon's so stoked on Giancarlo Stanton joining the Yankees, dude went straight PRIMAL when we asked him about the blockbuster trade.

"OOOOOOOOOH ... what a season we're gonna have, oh my goodness!" Jimmy grunted/said to TMZ Sports in the Big Apple.

Fallon's New York born and bred ... so he couldn't even try to play it cool talking about Stanton -- and new manager, Aaron Boone -- putting on the pinstripes.

The real question -- how are Jimmy and Giancarlo gonna top Aaron Judge's appearance on "The Tonight Show?"