The blogger Cardi B is suing -- over some wild allegations -- just got served in a heated exchange with the process server ... one that included an apparent threat of gunfire.
We broke the story ... Cardi's going after Tasha K for claiming the rapper's a drug-using prostitute with herpes. Cardi's lawyers hired a process server to deliver the lawsuit to Tasha's residence Thursday night.
Audio - Run-in - TMZ - Things - Dicey
This audio from their run-in, obtained by TMZ, makes it clear things quickly got dicey.
You hear the server ID himself to Tasha and a male companion as they...