Something or someone that is shorter than normal.
That squirrel is a shortie.
A short-handed goal.
They got a shortie at the start of the third.
Shorter than normal, especially of clothing.
a shortie gown; a shortie jacket
A short person.
A term of endearment for a child, younger sibling, shorter person, etc.
A child.
An attractive young female, especially one who is sexually available.
A girlfriend.