A really fat and ugly girl. Resembling Bigfoot. No offense to the fine folks in the Canadian city, but it's quite possible it originated with some burly and grotesque women who hailed from there.

Saskatoon is a dirty little town in the middle of the gap i.e., the area between the two civilized places in Canada (ON-BC). Also known as Losertoon, Dirty Hole and No-Name-Toon (or NNT). Losertoon has a significant amount of aboriginal population mainly peaceful, a lot of crows (that is A LOT) and infinite empty space. Some fun stuff to do if you plan to go there: --- nothing. If you are already there: RUN BABE RUN! BTW avoid the place if you are not blond, blue-eyed white. You see Losertoon has a long tradition with KKK which is still a main institution there.

A Sasktatoon is a really ugly girl. Sometimes overweight. It's another label along the thread of swamp donkeys and ditch pigs, although a Saskatoon has a less promiscuous connotation. Generally, just a physically hideous female specimen.

The act of putting someone's penis into his own asshole

When you don't want to go into work, but you gotta come up with some kind of disease to get out.

When you are eating a girl out while she is sitting on your face and she farts on you.

When in a male communal shower situation, like high school or jail, one or more of the men masturbate, then ejaculate on an unsuspecting bather. This will usually occur on the outer thigh or buttocks areas, but if the ejaculator has enough force, it can wind up on the upper back or scalp.
A lesser Saskatoon Shower involves getting urinated on in the same manner. It is conceivable that women can initiate an S.S. if they can ejaculate wit the proper trajectory and velocity.