Moose Day Posted in M Best definition Moose Day The 25th of January; first celebrated by silly girls in 2007. One must scream “Moose!” and splay one’s hands behind one’s head like moose antlers. “OMG! Tomorrow’s Moose Day!!!!” squealed the gleeful little kid. How satisfied are you with the definition? Looking for Moose Day meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 5 times.