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5.
1. A female race horse, especially one who races stallions and beats them

2. A confident, strong, muscular, athletic woman
1. I'll pick a filly over a gelding any time.

2. The 100 meter women's Olympic final will be a Battle of the Fillies
by Strongboy February 13, 2012
 
1.
a girl, chixor, chick, lady, female
man i wana get down with that filly
by lumberjack September 24, 2003
 
2.
A stylish young woman.

In Australia, it specifically refers to a young woman dressed up for the Spring Racing Carnival in Melbourne. Additionally, it is usually only used in the plural form.

It is taken from the term for a young female horse before she is old enough for racing.
1. "What a fine filly!"
2. "Check out those fillies in The Birdcage!"
by stuckdan November 06, 2007
 
3.
n. fil-ee
noun, plural: -lies

Typically refers to 13-30 year old female fans of the 2010 reboot of the show My Little Pony: Friendship is Magic. Similar as, but not to be confused with: "brony" (bro+pony) which is more often used for the male equivalent. It is a well-known and undisputed fact that bronies are on average about...20% more awesome due to their rarity.
ex. "You wouldn't think she would still watch that show at her age, but she's obsessed. She's a total filly!"
by LottieTheLolita August 19, 2011
 
4.
A female horse up to THREE years of age not two you dumbass.
Look, that filly just kicked the shit out of that loser!
by Missing8519 August 19, 2005
 
6.
A musical term, where you fill in a section with improv.,
After the hook, give some sax filly.
by KSNike March 17, 2011
 
7.
Slang term for a filter paper.
A man was smoking and kept getting ash in his mouth so next time he rolled he used a filly.
by Marbarian May 26, 2005