1. The act of balling one's hand up into a tight fist, and placing it into your partner's vagina, either vigorously or delicately. However it is usually rythmic.
2. The sensual act of ever so delicately teasing a woman lovingly, then suddenly penetrating with your entire fist. Can be quite effective when combined with suspenseful music. Make sure to wait until the climax of the song to ram your entire fist in.
3. Commonly referred to as a "hit below the waist" in boxing matches.
"Yo Derek I totally put a chick in the hospital last night!"
"Dude you didn't use roofies again did you?"
"Heck no man, I was cooterfisting!"
When a girl scooches up and leans with her legs open toward the faucet in the shower and turns the water on, creating an awesome feeling in the whole cooter region. Combines "waterfall + "cooter," and is often first discovered by younger girls in their baths.
"I was really horny when I was a kid, so I ran a cooterfall until I had a cootergasm."
While having sex with your girlfriend from behind you call up a friend and have him come to your house and take over for you without your girlfriend knowing, then you run around to the window outside and wave to your girlfriend.
Taylor: "Dude last night i gave my girl the david coperfield, it was great"
Alex: "STOP LYING YOU DONT HAVE A GIRLFRIEND!!!"
Taylor: *crys*