1. To flee or run away. This usage is primarily heard in the UK. We hooked it when we heard police sirens advancing.
2. To solicit and accept a car ride from someone, usually a stranger; to hitchhike. The phrase refers to the thumb (used to attract a passing driver's attention) as a "hook." If the bus isn't running today, what are we going to do, hook it?
hook itrun away. British informal
tv. to get a ride by hitchhiking. (The hook is the thumb. Compare to foot it.) My car broke down and I had to hook it home.