To take one's hand like you are holding a bowling ball, insert your fingers into a woman's orifices (vagina and anus) and chuck (throw) her as far away from you as possible.
This bitch kept getting in my face and I had to "poon chuck" her ass across the room.
The act of putting a tube in your rectum and putting the other end in someone else's and taking a diarrhea dump while both giggling hysterically as the poop is being transferred from ones anus to another.
"HeyMr. Simms tonight you and I are gonna poopchuckle."