Don't pee, Karen...
I guess she had to ge beforehand. As far as I can understand, at 0:22/0:23 a girl says "Don't pee, Karen, we are at Walmart", so she must have known the girl was bursting. (And does she want to indicate she could if they were at some different place?)
The uploader has a first name which can be male or female. I think he is male as a girl probably would not have chosen a title like "Girl pees pants at Walmart" - but I am not sure of course. I noticed that the only other upload of that contributor is also pee-related, however, without wet pants.
A nice and real find!