Abed hired a bunch of impersonators for fun movie recreations, but doesn't have the money to pay for it. When the guy (a French Stewart impersonator played by French Stewart) came to collect the money, he noticed the gang looked like celebs, so he offered to clear the debt if they worked it off.
Jeff's psychologist put him on mellow meds, and Britta is taking some human psychology class, so she knows that Jeff is headed for psychological trouble.
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Pimpin' still Aint Easy for this Pimp Daddy, even after 11+ years on GameFAQs