'To PJ down' means to get changed out of one's pyjamas or just to get naked in general
"Hey, I'm just going to go and PJ down..." = I'm just going to go and get changed out of my PJs

"Hey, I just PJ'd down" = I just got changed out of my PJs

"Hey, you wanna PJ down?" ;) = "Do you want to get naked?" ;)
by Albert E. 29 April 25, 2010

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