Waginus Flytrap

What you call the foreskin of your elbow in your inner arm when you smear it with jelly or anything sticky.
It traps flies trying to crawl or escape.

Person 1: There’s an alternative way to trap those annoying flies.
Person 2: What?
Person 1: Covering my inner elbow with jelly.
Person 2: Well?
Person 1: I now have a waginus flytrap.