Definitions by IonaRIB74
Monthday
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.