Beyonce Producer Detail: Drunken Warning ... Don't Get Married, Nicki Minaj!!

Nicki Minaj is about to make a huge mistake by marrying Meek Mill -- if you believe what her former producer Noel "Detail" Fisher is drunkenly (and awesomely) spewing in this video.

"Detail" had a blast partying at Henry's in West Hollywood -- like, REALLY had a blast. Fittingly, the man who produced Beyonce's hit, "Drunk in Love" ... was hammered when he offered Nicki some advice.

Kinda hard to ignore the words of a man sporting a top hat and cane while singing Christmas carols about himself and doing a James Brown impression.