What do it do

Singer: What you gonna does when you don't know what it do, do, do, do, do, do, do?
It's way too big to be a buckle, and too bland to be a belly dancer.
Or when it tries to get your height it's never right unless you're 3 foot 2.
When you come home, and you can't tell if it waved goodbye or waved hello.
And in the library it's useless cause' it don't care when the books are due do, do, do, do, do, do, do, do.

It doesn't seem to understand the game is not rock-paper-scissors-spaniel,
Instead of picking up the trash it started picking Lady Liberty's nose.
It makes a lousy baseball umpire or a brow-wiper for bongo players
And when it walks your dog it never really pays attention where it goes.
Do, do, do, do, do, do, do, do.
Do, do, do, do, do.
What do it do.