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A Pegasister is a female person who is a fan of the TV series named My Little Pony: Friendship is Magic, typically at the age of 13 or older. If you're male on the other hand, you would be known as a Brony. The plural for this term is Pegasisters, and the plural for the male term is Bronies.
Example 1: Hey mate. Did you know that my mother is a Pegasister?
Example 2: Hey mate. Did you know that my father is a Brony?
by James William Smith January 12, 2015
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A new, but not yet official, term for females who watch and enjoy My Little Pony: Friendship is Magic. They are mostly in the same age group as your ordinary brony. There is no different brohoof for pegasisters, so it's pretty much the same as being a female brony.

Related words: brony, brohoof, pegasis, My Little Pony
Brony: Welcome to the herd, fellow brony.

Pegasister: What? I'm not a brony. I'm a pegasister.
by Meggie Mayhem April 28, 2012
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A pegasister is a type of brony, and a brony is a male viewer of the cartoon My Little Pony: Friendship is Magic on The Hub Tv Networkโ„ข. A pegasister, using the correct terms, is a female brony. They watch My Little Pony: Friendship is Magic on The Hub Tv Networkโ„ข too but they are females. Some bronies say pegasisters cannot exist, yet others say they are fairly accepted into the neighborhood of bronies. Other types of bronies are /b/ronies. These people troll, usually on 4chan. Some bronies are ashamed of /b/ronies. Others don't care. Some /b/ronies are ashamed of regular bronies and pegasisters. Some people say /p/egasister for female /b/ronies, but not many people do.
Brony 1: Ugh look at that /b/rony!
Brony 2: They are such a disgrace..!
/b/rony: I am ashamed of you people, not trolling others! My people are the ones that make me like MLP: FIM!
Brony 1 and 2: *facepalm* So you only like it for the show?
/b/rony: Of course! Who ACTUALLY likes it?
All Bronies even the ones not listed: US!
Pegasister: I agree!
by ositapink01 @ YOUTUBE November 10, 2011
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The rare "female brony" as it is scientifically called. Pegasisters are seen on fimfiction.net a lot, and also (Rarely) have conferences similar to their male counterparts (BronyCon).
Dude, she watches MLP. She's a total Pegasister!
by ZeekHM June 25, 2018
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