What is Shitty Mccum-pants?
1.
Alternative name for a person who has a nasty habit of soiling their undergarments. Used when the offending "shreddies" are discovered to be hiding not only fecal stainage, but also crusty semen deposits.
"oh my God! Did you see the state of those
underpants ? What a Shitty McCum-Pants!
See