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Someone who routinely or habitually smokes jays based on a schedule.
John: You smoke two joints in the morning.
Smith: I smoke two joints at night.
John: You smoke two joints in the afternoon.
Smith: It makes me feel alright.
...
John: You're a jaycase.
Smith: ... I know.

See "Smoke Two Joints" by Sublime.
by marijuanacake February 21, 2008
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