Knockin' boots is an old western term for having sex. Derived from both he and she stripping down and slipping their boots under the bed which sometimes made a "knocking" noise. Sometimes the boots are/were left on during sex and the boots would knock during all the action.
I think I got drip dick from knocking boots with that hussie Ellie May.
by Bill Dailey September 22, 2006
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i was knocking boots with your mom
by Sean October 15, 2003
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(v) To have sexual intercourse. The knock refers to the man's hips hitting the woman's ass, which produces a slapping sound. The motion literally knocks her boots (buttocks).
"Bring your friend, I likes you two's I'll knock the boots, the sneakers and the house shoes." - Digital Underground (Flowing on the D-line)
by Stoic Seraph April 14, 2003
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The act of knocking two boots together, usually leather, for cleaning purposes or to test the strength
Why are you knocking boots?

They have mud on them.
by F. Roy. Dean Schlipps October 10, 2011
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hetero vaginal sex. The sound made sounds like knocking boots, unless one of the partners is fat
by Kung-fu Jesus July 29, 2004
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Clashing clogs, Bashing birkenstocks, lashing laces, hitting heels, etc.
There are many ways to say smashing shoes, but knocking boots is the most popular by far.

Also unrelated is the topic of fucking.
"The surest way to prove we're still alive
Knocking boots till we die"
- Devo
by Fatty wob November 25, 2015
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