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.
He Got Fired
Over a BJ at Work
5/10/2011 3:35 PM PDT BY TMZ STAFF
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