Top Definition
A female sibling of length 1-unit (typically 1 metre) who likes to ride on the other bus.
Hey Jim - I caught your sister rug munching one of her friends.

You've got an orthonormal gay-sis!
by Leonard_999 June 12, 2009
5 Words related to orthonormal gay-sis

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×