Meatus Mummy (Mommy for yanks) is a prison term, descriptive of somebody who can shove a narrow object, such as a AAA battery, into their urethra, then "give birth" to it.
Did you see the Meatus Mummy scene on that CBT video? Sick!
An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"
Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."