Otherwise known as the Chicago Snack, a "C-Snack" occurs when a man pushes one of his testicles completely into the anus of a woman for personal enjoyment/accomplishment.
"I was doing stuff with this broad last night and she asked if I would pound some anal beads into her ass, but instead she ended up settling for a C-Snack."
by Mammon Fahad January 28, 2008