The title truly says it all. The box cover text further clarifies things by shouting "All girls! All pissing!" They go down on each other and use vibrators and dildos, too, but mostly it's pissing.

The DVD menu calls this disk Glamour Girls Pissing and the beginning credits call it Page 3 Girls Pissing, so there seems to be some confusion about what the baby is named, but there's no question about the fact it pisses. Through panties, through jeans, through exercise shorts, on strip club floors, on dressing room floors, on gym floors, on steamy green lawns, into men's metal urinals, in bathroom sinks and in bathtubs. These girls will piss anywhere, and do it copiously.