A way to say that one is "high" from Marijuana. For example you could, "wear a hat" (In the current state of being "high") or "put on a hat" (referring to the
action of getting "high"). It is a way to tell
somebody that you or someone else is "high" without being to
obvious.
Kyle: "Hey
man, you tryna watch Intersteller?"
Jordan: "Hold up, lemme put on a Hat first."
Or
"
Yo, just so
you know, I'm wearing a Hat."