What is fucking jacket?

"A Fuck Jacket is a critical defense against Unwanted Pregnancy."

"I always make sure to have a Fuck Jacket on me in case of random strange."

fucking jacket - video

Fucking jacket - what is it?

What angry, forgetful people call regular jackets most of the time, because they can't keep track of it. May or may not actually be used when fucking.

Them: Where's my fucking jacket?
You: Over there, next to your regular one.
Them: What?
You: Nevermind