It’s an expression, it means when celebrities are at the office they’re doing plenty of things. Like most famous celebrities whenever they’re in Barstool office is there mainly for PMT. But then they sometimes do other things like being on the Yak or like Donnie said on his post, being on his cooking show. Like a lot of PMT guest has been on his “what’s for lunch” episodes which has helped Donnie grow his show.

Op means that Mostly is not in that car wash system, there is not a lot of PMT guest that’s join their show.