The rap star announced on Monday that she had punctured her intergluteal cleft with some new "Drip" ... or as she eloquently ...

So when fans doubted she got a piercing on her butt ... Members of Cardi’s vast followership dared her to prove she had added drip to her posterior, which apparently triggered the Invasion ...

posting an up-close look at her new butt crack piercing, after some fans doubted its existence ... followers that she had punctured her intergluteal cleft with some new "Drip" ... or as she eloquently ...

Brian, who owns Body Electric Tattoo in Los Angeles, applauds the "WAP" rapper for getting such a "cool" bit of drip ... but warns the strategically placed piercing is NOT for the faint of heart.

Cardi B recently shared never-before-seen photos of her adorable children after revealing a bold piercing. The 32-year-old ...