Conor McGregor Faces Off with Eddie Alvarez at UFC Weigh-ins

Conor McGregor and Eddie Alvarez just went toe-to-toe for EVEN MORE smack talking at the UFC 205 weigh-ins ... jawing at each other while Dana White pulled them apart.

Conor took more shots at Eddie -- claiming the fight will be just another day at the office ... "I do this every week."

Eddie vowed to silence the crowd ... and promised to shut Conor up for good.