The act of licking a partners anus and it's surrounding areas. The term draws a parallel to tossing a regular vegetable salad, where all the comtents of the slad are mixed around with salad tongs. In the sexual variety, the reciever of the "tossing" has all the contents of the anus (hairs, lint, dingleberries) mixed around by the partners tongue, which provides moisture (dressing)and essentially serves as human tongs.
The act of taking a dump so long and solid, it hits the bottom of the bowl and when it breaks free from the anus if falls forward hitting your testicles like your butt just caber tossed a poo.
Hey, you know that shit I just took? Well, I just caber tossed myself.