Seriously though, the green weenie is a fly that seems to attract trout both because of it's shape & color - bright chartreuse green. It can imitate some green caddis flies & also green inch worms, too. It's effective as both a wet / nymph fly & also great when fished as a streamer.
No matter where it came from, or how it got it's name, the green weenie remains an effective fly for trout as well as steelhead in many places outside of Western PA. It is a great fly to start someone out with in fly tying, too, because of how simple it is. The legendary PA outdoor sports writer Charlie Meck called this one of his "one minute flies" because that's about how long it takes to tie one.
Here's a short video showing how to tie this pattern:
(one note: this is a slight variation of the green weenie in this video. It's traditionally made with medium, or even micro, chenille - not the fuzzy stuff shown here. It's also usually bright or fluorescent green. I'm showing you this video because the tying is spot on, the colors are close, & it's the best video I could find to show how to tie it.)