Sitch's Dad: He Got Fired Over a BJ at Work

5/10/2011 3:35 PM PDT
The Situation's dad is hitting his son way below the belt -- releasing a SECOND video clip, claiming the MTV star was fired from a job for receiving oral sex from a 40-year-old co-worker ... inside his office.

Frank Sorrentino doesn't offer any proof to support the allegation.

Calls to the Situation regarding the video weren't returned.