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A totally badass girl. Always there for her friends and always giving great advice. An Onnie is very very cute, with a little ski-sloped nose and blonde hair. Boys always fall in love with her. They generally have an awesome best friend named Lisa and a really cute boyfriend named David. Onnies are always up for an adventure; whether its streaking, raving, or committing grand theft auto, shes always there with a pair of stunnah shades and a positive attitude.
Josep- "Dude I totally wanted a one night stand with this girl I met at the party last night...."

Sam- "Well, what happened man?"

Josep- "I fucked her, but then I accidentally fell in love with her... so I called her back."

Sam- "Ahh... yeah, she's an Onnie huh?"
Onnie by VanillaTwilight March 1, 2010
Related Words
It’s like a offie but exactly opposite
You is that kid a offie, naaa he a onnie.
Onnie by I’m on onnie March 15, 2019
A black girl with big tities who will literally laugh until her stomach hurts and she has a headache. She is normally super tall.
Woooooow, you can’t srop laughing? You must be an Onnie
Onnie by Onnie_456 November 8, 2018
Onnie is a girl with short brown hair and is so weird that its funny and is always there to make you smile till your lungs stop she is the life of the party her friends are the same they are the group you can call to make you laugh when your sad.
Girl 1: Is that Onnie why is she laughing so hard ?
Onnie by Yuhh_mioa November 21, 2021

onnie x oxy 

Onnie x Oxy is a odd relationship but is one of the most loved. A tale of a Fox and a Shark that hate each other but love each other and will do anything for each other. Although they might not see it and deny it in reality they just might be the ones for each other.
Onnie

Oxy
Ex. "I ship Onnie x Oxy!"

C’onnie 

Keep it solid and stay to herself but she will spank your bitch ass
C’onnie the most solid in the group
C’onnie by anonymous November 21, 2021