To be acting in a
silly manner, especially so by completing a task in the least efficient, most idiotic way. Derived from the
slang "mickey mousing", which was used to describe when someone would do
something using the improper way, material, or method.
Yo guys I totally moused that math test, You just add denominators
straight across, right?
Hey, sorry I can't come to the party tonight, I'm in a mousey mood.
Look here buster, you are one
hair away from an ass whooping, so you
better stop mousing it ASAP.