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A total mess of a party that happens in some random place like a boat, library, or club, and you have to show up in your pajamas or sleepwear, usually in the middle of the night, because everyone is too wasted to care.
My cousin threw a Pajama Jamie Jam in the library at 2 a. m. I showed up in my pajamas and my uncle was wearing a bathrobe and a sandwich.
The boat party turned into a Pajama Jamie Jam when the toilet started leaking and everyone just gave up.
I got DMed at 1 a. m. saying there was a Pajama Jamie Jam at the club and I had to show up in my pajamas or I’d be kicked out.