Well, Urban Dictionary online says it’s:
“1. Street Squid
A slang phrase, used by professionals in the motorcycle industry. Often to describe male riders, who are overly fashion concious, ride with reckless disregard to others, are abundantly cheap when purchasing quality, safety equipment, and are generally ignorant of the specifics of their own machines. These people are frowned upon by serious enthusiasts of the sport, as they set a bad example to others. They view motorcyles, not with the respect and responsibility they command, but simply as an extension of their penis. Frequently the cause of accidents, and subsequent high insurance rates.
“Dude’s first bike, was a GSXR 1000. And he rode it, in shorts and a t-shirt. That MOFO was PURE street squid.”. “
Funny story, I first signed up for this site with the name “Squid” not knowing anything it implied. Squid was a nickname a guy I used to work with gave me when he said I looked like Squidward from the show Spongebob after I had shaved my head. Eventually after awhile of being called Squidward it got shortened and just became Squid. I’ve signed up a few places with the name, albiet not anything motorcycle related, so it just came naturally when I sgned up here to call myself Squid. Took me a week or two to realize the shirt on the front page and google it. Talk about having egg on my face!