LeftHook (US: RightHook) v. To strike, or come close to striking, a cyclist by moving across them unexpectedly and/or unnecessarily. "The driver lefthooked me" n. The action of committing a lefthook
"It was a textbook lefthook"
The first matter to clear up is that a lefthook does not, in fact, come from the left, but rather is moving 'to' the left from the right. This may be a source of confusion, but can be easily remembered by reference to the direction of the wind. A 'westerly' wind is coming 'from' the west. A lefthook is the opposite. Clear?
The action involves moving across the front of a cyclist, or in extreme examples into the side of a cyclist, in order to access a turnign on the left. It will usually require the cyclist to take avoiding action, making full use of brakes, voice, and occasionally a single finger of the hand if braking is no longer required.
The above video is a prime example of a LeftHook.
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Ooooooaaaaarrrrrrggghhh v. To require that a cyclist in the vicinity of a motor vehicle vacates the immediate area of that motor vehicle for fear that he may suffer injury and that if he does not vacate the area his parentage may be in question as well as a leaning towards onanism
There are many regional variations to 'Ooooooaaaaarrrrrrggghhh' which may later the length, or the tone and pitch, or make use of the doppler effect, and so it is easy to confuse these variations as completely different words, but they are, in fact, the same all over the country.
Standard responses to this call from a motor vehicle may include "I'm sorry I didn't quite catch that," "Huh?" or "Could you please repeat that more slowly I am Spanish and I don't understand English very well." However in all cases such a response is usually unnecessary as the motor vehicle will have moved out of audible range and the occupants will be unable to understand words above a basic neanderthal grunting.