Define Shower Pocket Meaning

"oh wally, dont be such a shower pocket!"
"is it just me, or is jon being a real shower pocket today?"

I've never met a bigger shower pocket than Frank.

That must have been a big effort for you to have been such a shower pocket at the party last night.

Zoe: "can I have some of your pocket shower, I'm feeling hot".
Lexie: "no bitch get yo own pocket shower!"