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1.
A "PajamaJam" is a fun, chill session at night in your pajamas. It was started in the Big Brother house during the 13th season. It was made famous by Dominic "PT" Briones, Daniele "Dani" Donato, Kalia "Sleepy" Booker and Lawon "Superpower wanting" Exum. The fun now continues on Twitter by following PT (aka @dominicphillip)
A night without a PajamaJam is like a day without the sun.
by paigers1793 August 20, 2011
 
2.
Is a party thrown by a person or persons in which you wear your Pajamas to.
Lisa is throwing a Pajama Jam this Friday I can't wait.
by Lisa fowl June 22, 2013