look up any word, like cunt:
 
1.
Simple or goofy person out to have fun with his friends.
Dude that guy is simpy! He always laughs.
by Goofster June 20, 2005
 
2.
Simpy is used as short word when describing a person who is a simpleton. Someone who's mind is so simple, they cannot always grasp concepts. Like a monkey. They also are known as numskulls, blockheads, ninnys, and dopes. A good example of a simpleton would be Jessica Simpson, also known as Jessica Simpleton. You can also use simpy when some one is acting a fool or foolish.
Use simpy as such:

"Melissa, your so simpy!"

or

"Melissa, your such a simpleton!"

or

"Melissa, your such a simp!"
by my bff rose March 05, 2010