The Gold Cup is returning to the U.S.A. — and the champions celebrated with an all-out rager for the ages … including a makeshift Slip ‘N Slide, chugging booze from the trophy and having a T-Pain jam session!!

Sunday night’s finals match between the U.S. and Mexico was nothing short of an instant classic … with Miles Robinson nailing a header 117 minutes into play to put the Red, White and Blue up 1-0, which would be enough to secure the victory.

With a dramatic win like that, the guys had to let loose once the championship was secured … and they didn’t have to go far to get it going — after all, the game was in Las Vegas!!

But, before the champs could even make it to the strip, they decided to get it poppin’ by having a booze fest in the locker room … with Sebastian Lletget and Paul Arriola diving on the ground and trying to slide as far as they could!!

Eryk Williamson also had a blast — chugging right from the Gold Cup!!

Eventually, the guys had to take the celly to the Vegas strip, hopping in vans where goalie Matt Turner — who played out of his mind — was really feelin’ himself to “Buy U A Drank” by T-Pain!!!

The guys finally made it to the Bellagio to continue the rage fest … and at the time of this post, we’re not completely sure if they ever went to bed.

Enjoy the party, boys!!!