That's exactly what happened to Jack Harlow Monday night -- the rapper linked up with the Miami Heat star after they took on the Knicks ... and was gifted Herro's sweaty threads right off his back.

Of course, Harlow gave the 21-year-old sharp-shooter the ultimate shoutout in October 2020 with his single titled -- you guessed it -- "Tyler Herro."

In fact, Herro made a guest appearance in the music vid ... when Harlow says, "My homeboy, Tyler, he play in South Beach. He told me this summer he gon' fix my jumper."

Harlow -- who's fresh off performing the hit track on "Saturday Night Live" this past weekend -- decided to stay in town a few extra days to watch his buddy play at MSG ... all while mingling a bit more with 'SNL' star Pete Davidson.

Harlow and Herro got to chat after the game ... and posed for a pic on the court while Harlow held up his new gift.

BTW, Harlow picked a solid game to attend -- Herro racked up 18 points, 4 assists and 3 rebounds in the 98-88 win for the Heat.

No word on whether Herro ever helped Harlow with his jumper ... but the rapper DID team up with Quavo to beat Lil Baby and 2 Chainz in a celeb game during All-Star weekend.