Top Definition
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")
by ray jr. December 10, 2009
1 more definition
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
by RiverBoY April 02, 2012

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