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1.
Another way of saying "let's go."

It originated late one night when a teenager was having trouble speaking but wanted her friend to follow her.

Relates directly to a traffic light giving you the right of way, but can be used in any context.

Usually said on its own and not in conjunction with other words or sayings.
Carly: "It is for crossing."
Casey: "Oh, ok." <they both walk across the street>
by personal experience March 30, 2005