1. someone who smokes/eats excessive amounts of cannabis.
2. someone who acts as though they have used large amounts of weed.
3. Someone who does stupid things/acts a bit screwed up and smokes weed/prefers to be called weed head to crack head.
Can be used in place of "crack head" in most cases, unless you're actually talking about/to someone who does actually use crack.
shit your a weed head
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