porschegrl
has resting clueless face
- Joined
- Feb 25, 2009
Never done it myself, but I saw it in movies and comic strips. This kind of explains it with a made up word for the practice:
https://www.astro.umd.edu/~avondale/extra/Humor/MiscellaneousHumor/Sniglets.html
BOVILEXIA (bo vil eks e uh) n. The uncontrollable urge to lean out the car window and yell "Moo!" every time you pass a cow.
So, in other words, it's not "the joke in the United States." It's a thing you've heard about, that some people may do, but that isn't as widespread as you made it out to be.