Sharp as a mop

A person who may not be astute but has a seemingly purposeful presence. The person may be useful but doesn't have an external awareness. A mop serves a purpose but is not a intelligectually significant.

You're sharp as a mop.

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Patootiepie

A patootiepie defines a cute person who carries out something in a silly manner.

Sid was a patootiepie because he used to listen to high school musicals during his gym sessions.