Dog Fisting

When engaging in sexual intercourse you use your hand and mimic a dog as if doing a shadow puppet. Then proceed to insert your middle and ring finger in the vagina and your pinky and your partner's anus with a back and forth motion like you're hitting a punching bag.

(for enhanced experience you can imitate the barking/howl of a dog. While opening and closing its mouth with your hand)

Guy1: bro you wouldn't imagine what I did last night
Guy2: what's that?
Guy1: me and my girl were having sex and I started dog fisting her ruff ruff mf!!!

Competitive Dog Fisting

Competitive Dog Fisting, or CDF, is a term used when a group of people begin randomly competing over something meaningless, using a lot of effort. If it's all in the name of good fun, it's just Dog Fisting.

You see those idiots? Competitive Dog Fisting over a spot in a frozen yogurt line.