When you sneak up on a sleeping person while they are sleeping on their stomach and have anal sex with them, without waking them up.
Comes from old times, when the butt flap was still popular.
Note! There must be no consent for this to work properly.
John: Dude, you and your woman have a good time last night?
Jack: Yeah, I pajama'd her and she didn't even make a noise!
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