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knock back 

The act of some one attempting to pull you but your not interested and you give them the finger
Girl :Hey your really nice, you wanna go for a drink some time?
Boy :Err sorry not interested.
knock back by Nick July 9, 2004

knock back 

To get a "Knock Back" from a club/pub

Not allowed in - knocked back
I just got a knock back from that bar

also see - K.B.ED
knock back by ba March 26, 2003

knock the back out of

This is normally associated with sexual intercourse carried out at a rough and vigorous pace (most commonly doggy-style), although it can be associated with any activity where it is performed with gusto. This means that you did whatever it was you were doing with particular enthusiasm and/or speed
Good morning Casper. I had a cracking time knocking the back out of Lady Clementine Smyth last night

or

Gadzooks, I could certainly knock the back out of a few glasses of Moet this evening
knock the back out of by Cockles August 29, 2006

knock it back 

take a drink of liquor in in one swallow, or very quickly
Marlowe woke up on the floor with a hangover and throbbing from a blow to the head. He poured half a tumbler of bourbon and knocked it back. Not a cure but would have to do for first aid.
(past tense of "knock it back")
knock it back by ray jr. December 10, 2009

I'd knock the back out of that! 

Said about a sexually appealing woman, with whom you would be very eager to have sex.

To explain the metaphor: you may be a little too vigorous, and push your penis all the way through her, hence, knocking the back out of her... Obviously not physically possible, but a good, although rather crude, metaphor
Guy A: Phwoar, Check her out, what a stunner!
Guy B: God yeah, I'd knock the back out of that!

knock it back 

A sexual phrase. Meaning during sex your head will be knocked back due to the amount of pleasure you are receiving.
Usually implied as oral sex
Damn she is fine, she can knock my shit back
Hell yeah last night she knocked it back
You can tell she'll knock it back for ya
knock it back by RiverBoY August 26, 2012