this term can be used to define either one of two concepts:

a) in boxing, a hard, sharp, diagonal punch to your opponent's left side of the face with your left hand, when you are facing them, regardless of whether you yourself are actually right or left handed.

b) when 3 total strangers, a male and two females, sit in a row at a public place such a park bench or a city bus, the male sitting in between the two women, and the guy randomly decides to hook up with the woman sitting to his left.
two gentleman talking at a local bar after boxing practice:

guy a): you really annihilated Tony with that left hook of yours, which I really liked. Where did you learn your left hook anyways?

guy b): from Sherlock Holmes, of course, roflmao. Didn't you know that Sherlock Holmes was a great boxer, with one of the wickedest left hook to be found in Europe in his generation.
by Sexydimma January 28, 2012
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Saying a comeback out of no where, surprising them.
Uncle: why can't you don't it?
Mom: Why don't you get up and work for once?

Uncle: My mom left hook me this morning.

Friend: No way what she say?
by CoastingKidd June 27, 2015
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One with a nose crooked to the left in a way, that appears to be the result of a violent blow or left hook.
The old boxer appeared to have a left hook nose.
by I, Wreckerrr October 15, 2016
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RT left hook is one of the most devastating punches a person can ever receive. Fortunately, only 4 people have experienced such a blow but the impact from these blows has been devastating not only for the recipient but for their family members and doctors who have had to care for them as well. An RT left hook essentially is a left handed punch. What differentiates it from any other left hand punch is that it is immensely more powerful, dangerous and potentially deadly. IF you would really like to scare off a bully or take a more authoritative position amongst your peers, threaten them with an "RT left hook".
-How did you dummy him? "I gave him the RT left hook!"

This is sure to leave victims and observants speechless and most likely, very disturbed.
by RT left hook witness August 12, 2009
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when your penis bends upward and to the left
Look at Mike's cock it has a serious left hook with an uppercut
by CARS December 7, 2005
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A metaphorical term describing the cheap verbal shots a Lepis takes on his victims.
Left Hook Lepis making fun of Josh Joggers.
by JoshJoggers January 13, 2015
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