The act of inserting icecubes in ones partners anus then having anal sex. The icecubes are for pleasuring both partners. The ice is supposed to numb the anus for the receiver making it more comfortable and less painful.
I first heard it on the Bubba The Love Sponge Show.
Marsha: Greg told me he wanted anal sex again, and I told him no because it hurt the last time.
Jan: Well what did do?
Marsha: He suggested putting icecubes in my..... poop-shoot! He called it a Syberian Doorknocker!
Jan: Well did ya'll do it?
Marsha: Fuck yeah. I had an assgasm and I was numb all inside.
tethering a pretty naked girl to a fixed object (usually a doorknob) using a single pair of handcuffs by fastening one cuff about her wrists and the the other cuff about the fixed object
After doorknobbing Alison to her closet door, Martintickled her sides till she cried from laughter.