Joe: "How was that threesome last night?"
Bill: "It was going really well until me and Bob dongknocked. Then it was just awkward."
Jow: "The chick was hot though right?"
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.
A Bongknocker is an entity (human or animal) who would rather run through your bong, knocking it over, spilling the water and potentially breaking it, as apposed to walking around it respectfully and gracefully.
A discriminatory word used against those who follow the religion of Mormonism. This is because of the tendency for Mormons to go door to door trying to spread their religion/ book.
"Who was just at the door, honey?"
"Oh, just one of those Doorknockers."