Sniped from "Wiki"
Squid is a slang term used to describe an irresponsible motorcyclist. The term is common among motorcyclists in North America.
The term is generally used to describe a motorcyclist who rides aggressively, erratically or beyond their capabilities. Squids are perceived as overconfident and often ride without appropriate safety equipment, such as a helmet, gloves, leather jacket, riding pants, or boots.
The origin of the term squid is ambiguous. It is commonly said to be a contraction of squirrely and kid, or less commonly, squished and kid. It might also have something to do with the appearance of a lightly-clothed person who has fallen off their bike and slid chaotically down the road; the resultant injuries may make the unfortunate motorcyclist resemble an amorphous tentacled creature.
Squid is also described occasionally as an acronym, although these are likely backronyms.
"Stupidly Quick, Underdressed, Ignorant and Dangerous"
"Stupidly Quick, Underdressed and Imminently Dead"
"Super Quick Until I Die"
"Speeding Quickly Until I Die"
We have the Unfourtunate pleasure of having roughly 200,000 +- come to our neck of the woods every year for "Bike Week"