Pajama

[Sarah]

A Private Joke (known as a PJ). A PJ also means pajama.

[Oralee]

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.

[Merna]

(v) to openly [cock block] [someone]

[Sarah]

US spelling of pyjama