Dylann Roof Got Dat A&& Whooped In Jail Yesterday!!

DYLANN ROOF is the racist punk who killed nine people in a South Carolina church last year.  And yesterday he was assaulted in jail . . . just outside the shower.

A 25-year-old man named Dwayne Stafford bolted over to him from an unlocked cell, and punched him multiple times, in the face and back.  Dylann was bruised up, but wasn't seriously injured.  (Unfortunately.)

Dwayne is African American, and it's probably safe to assume that he knew who Dylann was.  He's in jail on charges of armed robbery and assault, including attacking a police officer.