(historical) A con game played with a chain, belt or string that is laid down to form two open loops. The mark places a finger or stick in one of the loops to try and secure (fast) the chain when it gets lifted, but either loop can fast or fail to fast (loose) the chain around the mark's finger/stick depending on where the con artist decides to lift the chain.

(often in the plural) Any of a group of friends who are often in each other’s company, and appear to be inseparable

(idiomatic) In a lifestyle, employment position, or other set of circumstances where the rapid pace is exciting, frantic, or risky.

Catch! (when throwing an object unexpectedly)

(transitive) To cause playout of (a video, audio, or other digital media file) to move very fast backwards in time, so that when the device is played, it will start at an earlier point.

Firm or planted in the earth, and difficult to remove.

Moving or changing rapidly.

plural of fast food

Offering, or relating to, a style of mid-priced restaurant dining in a casual atmosphere, usually with freshly prepared food but without full table service.

(slang, chiefly attributive) A hotel or similar establishment catering to prostitutes.