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1.
another name for Taiwan which also means the butterfly kingdom.
Guy1:Where are you from?
Guy2:Formosa
Guy1:And where's that?
Guy2:Taiwan
Guy1:Oh okay, i got it
by therealK April 14, 2009
 
2.
A very prestigious Mediterranean family tree. Wealth and old money passes down the line. Formosa's are usually haunted by their own vanity.

Most of the Formosa's live in western Canada, but reign all over the world.

Formosa also means "beautiful" in Portuguese.
Formosa! Wow, I know your uncle! Can I have some money if I compliment you?
by Chris_Anderson June 16, 2008
 
3.
A stinky poo.
I just dropped the biggest Formosa!
by Cyanidius October 21, 2013