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
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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 21, 2010
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