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.