Lil Uzi Vert Slips In NAV's Pool After Attempting Daredevil Leap

Lil Uzi Vert's futsal footwork couldn't save him after he tried to play leapfrog at NAV's outdoor pool ... and the Philly Eagles ambassador was caught in 4K slipping on his ass!!!

On Thursday, NAV posted studio cam of Uzi attempting to hop his way into the island in the middle of his pool -- only to slip on the border and embarrassingly plunge into the water!!!

NAV can be seen bursting out laughing to the point he misses the dap Uzi tried to give him to assure he didn't break any bones!!!

The two wavy artists are frequent collaborators so fans will be happy to know they have another collab coming, which may end up on Uzi's highly anticipated album ... a project he's been successfully building buzz for.

Uzi's been everywhere these past few weeks -- recently repping for the newer class of rappers at the Grammys' 50th-anniversary hip hop tribute, and even marching the Eagles to victory with his hit record "Just Wanna Rock" during their route to Super Bowl LVII.