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1.
The FIRST tuesday of the month where one consumes large quantities of cannabis.

MBTJustin was misinformed.

Mailbox Tuesday is also a group of people who have come together to form a strong connection (sexual relationship).
DJ: Hey guys, it's the first tuesday of the month.

Katie:Happy Mailbox Tuesday! Let's blaze!!

Brad: I'm gay!

Joey: HEWHEIEEEEHEHEHAHHAHAUEEOOO?

Tyler: I'm cool, let's hang out next sunny day. (I'll actually be snowboarding that day)
by DJK420 July 31, 2010

Words related to Mailbox Tuesday

420 cannabis
 
2.
The second tuesday of every month, when one indulges in a mass amount of cannabis smokage.
Joey: Hey man its the second tuesday of the month!

DJ: Mailbox Tuesday! lets smoke a ton more weed than usual.
by MBTjustin April 20, 2010