look up any word, like fleek:
 
1.
an extremly cool person with a large and colorful imagination who can make neone laugh untill they pee their pantolones.
that chick is extremly wack, shes such a cassi!
by monique the cracker May 07, 2006
 
2.
Usually has a dark sense of humor. Tends to have dark hair and green mesmerizing eyes. Looks great in red. Rarely cares what you think, you are probably wrong anyway.
guy 1-"Wow, look at her, she is intoxicating."

guy 2- "Yes, a total Cassi."
by Lovely Locks August 14, 2009
 
3.
An extremely hot girl , mostly brunette with killer, amazing brown eyes. She always has an upbeat personality to her and is always smiling with her big smile! Get at her if she is single, because a girl like her is hard to find;)
WOW! look that that Cassi, she is one of a kind.
by boy at st November 18, 2010
 
4.
A Cassi describes an all around type of girl. She has the looks, personality and great taste in music. She is the perfect package. Enjoys having fun, but still manages to keep work and fun in check.
Man, I met this girl today and she is the whole package. She's definitely a Cassi.
by Quazimoto824 November 07, 2010
 
5.
the most amazing person you will ever meet. shes pretty fun to be around and always makes you happy. she is especially known for her heheing and somtimes makes weird noises..but at the end of the day you cant help but love her
i love cassi
by cassiisamazingg July 15, 2011
 
6.
A cassi will have a very upbeat personality, she always has a smile on her face, no matter what! She's very cool and very pretty!
wow, she's a cassi!
by ordinaryrunofthemill November 27, 2012
 
7.
A very beautiful girl, who plays a lot of sports. She also got a DONKKKK. She is always laughing and has a great smile. She loves her friends and family. If she's single, you better get at her, because she won't be single for very long(; She knows how to brighten your day when your feeling down. Piss her off, and you'll see a side of her that you won't want to see.
Guy : that asssss!

Girl : Why can't I be Cassi?
by Kittenlover March 27, 2013