A unit of measurement that serves as a placeholder for any length of time needed to accomplish a goal or complete a task when you do not know how long it will actually take.
Boss: I need those tax documents on my desk before the end of this quarter, Billy!
Billy: Sorry Sir, I can get them to you within 3 weeks.
Boss: ... You're fired, Billy.
by Zinaal_Kriid September 21, 2020
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The rule that states that if an individual has left an item at a friend's house that hasn't been moved or used within a 3 week period: then that item may be used by the household's occupants as an improvised ashtray.
Nathan: "Dude I was gonna make a coffee why the shit is my coffee mug full of ash and cigarette ends?"

Billy: "3 week rule man you have plenty of time you move it or use it"

Nathan: "I was in hospital I was in a fucking car crash you dick!"
by Hamster_Jelly February 10, 2017
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The habit to smoke weed only on 3 days a week and with this act defining your personal 3-day-weekend at the same time.

On the other hand it's a rule, which helps stoners to keep 4 productive days to live the creative ideas the weed consumption in the other 3 days gave them.

The rule descents from the seek of balance, the constant lookout for keeping Ying and Yang in whatever sort of equilibrium.

If the rule is applied in a strict way, a day counts as as weed day whenever a first consumption takes place no matter what time of the day it is.
I tried straight edge some time, but now I am doing the 3-day-weed-week.
by LutherBlissett42 September 30, 2022
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A time when a boy doesn’t talk to you or “ghosts” you for 3 weeks.
“He’s pulling a 3 weeks, should we break up?”
by Sunflowers45 July 9, 2019
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