Meatus Mummy Share definition Flag 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! Meatus Mummy by Count Fistula May 2, 2005 Get the Meatus Mummy mug.