The very first pair of the Nike Air  Mag — the Marty McFly shoe from “Back to the Future II” was auctioned  off in L.A. last night … and the winning bidder dropped  $37,500!

The auction — co-hosted by Joel McHale —  went down at the Montalban Theater … and after an INTENSE stand-off  between two shoe-a-holics … the winner was eventually crowned.

Along with the shoes, the winner also received a “plutonium case” where he can

store his “McFly’s”

Oh, and McHale also promised to throw in a puppy … we’ll find out if he REALLY meant it.

So … what kind of a person drops $37,500 on a pair of crazy “Back to the Future” shoes??? A 22-year-old British rapper named Tinie Tempah … that’s who.

Who The F*ck Is Tinie Tempah Again???

Obviously Somebody that Got 37 Racks to spend on some moon boots!!!!