Top Definition
A monthly holiday celebrated by calling off work or ditching school for no good reason on the third Monday of every month. A day to recover from Sunday Funday, too much Football, or a three-day bender. After receiving that second paycheck of the month, with no major bills to be paid, it allows extra time to spend frivolously and act lazily, foolishly, or otherwise irresponsibly.
After watching the Bears-Vikings game on Sunday Night Football at the Mirage Sportsbook bar, Jeremy realized that it was Monthday Weekend, so instead of getting on his plane to go home and get ready for work, he decided to stay in Vegas one more night and get a hooker instead.
by IonaRIB74 September 09, 2009

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