An extremely unattractive man or woman pushing / carrying a small child solo...This person generally has a hump
on their back or a very large gunt
will be present, they will sweat while eating, smells, if it is a female "who done it" she will almost always have facial hair or large moles with hair growing from them and will be wearing crocs with bare feet. The person is a "who done it" because nobody will actually own up to having sex with said person and producing the enevitable ugly offspring.
Dude look at that chicks moustache its thicker than mine and she has a kid!..she's a "who done it" for sure