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.
Having a little snack or meal all by yourself
I sat in the corner and had a little mouse meal earlier
a cartoon with 22 results on rule 34
Cartoonaboo: 12 oz. Mouse SUCKS ASS
Son of Ben the Rat, made by Fastgod on the indie site Gamejolt
You know that OC Marshall the Mouse?
When your girl is so amazing and sexy she/he is always happy bubbly out going and loves kids show
Damn your girl is so mystery mouse contul