It is? Wow. I've seen a number of sources mention it.

Yeah, it's used often. But I bet none of those soruces could come up with a published origin.

lol!!!!!!1!1!! tHaTs A gOoOd OnE GC!!!!!!!!!!!!!!!!
VeRy cOoL lOl!!!11!!

Kind of reminds me of

Capitalization is the difference between "I had to help my uncle Jack off a horse.." and "I had to help my uncle jack off a horse.."

This too is apocryphal. Doesn't it suck when all the things we know turn out to be lies our teachers taught us?

And there's George Carlin's fake TV show about a National Park worker and his special friend:
Ranger Dan and his big dog Dick.
or
Ranger Dan and his big dog-dick.