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1.
When you smoke pot on a day that is a milestone in your life such as a 20th birthday.
(While High) Dude, your 20 on Dec. 10 in the year 2010..milestoneddd
by eschh December 10, 2010
 
2.
When you witness something groundbreaking when you are stoned.
California was milestoned when Proposition 19 passed.
by Mr. Cannabis November 01, 2010