Farting unintentionally while urination is occurring due to relaxation of the sphincter. An expulsion of pressure which leads to many an awkward public toilet moment.
I laughed my head off as I heard the lady in the next cubical do a squeaky one before her stream flowed. It was a belting pee fart!
I was dying to relax and pee but I knew a fart bubble would be released prior and everyone would hear my pee fart.
Also known for being a commentary on society itself. It's counter part is "pee pee poo poo fart." Not only is poo poo pee pee fart a commentary on society but is a cause of discourse in the piss and shit community. The majority of people will say put the pee pee first, but the minority of people who put the poo poo first no longer wish to be silenced. An uproar is coming.