Diddy tapped out on his "Brother Love" shtick QUICK ... but the original Brother Love -- pro wrestling legend Bruce Prichard -- says he still wants to kick his ass!!
Here's the deal -- Puff announced his latest name change over the weekend ... not realizing it was already taken by The Undertaker's famous ex-manager.
After wrestling fans DESTROYED the hip-hop mogul on social media -- Diddy decided to give it back.
But Prichard ain't taking Diddy's attempted nickname robbery sitting down -- issuing a challenge to meet mano-a-mano inside the ring.