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Your sister (biological or unrelated) that is also your bae.
She is both my baesis for life and basis of life.
Baesis by awesomehuman May 27, 2015
Related Words
used in the U.K. to call dibbs, to claim first choice, by saying bagsie you are saying it is yours because you are the first to claim it.
bagsie shotgun (i will sit in the front passenger seat)
bagsie in goal (i will play as goalkeeper)
bagsie yer iphone (i know blackberry is better but if that shit is goin fer free..)
bagsie by nickthetwat May 8, 2010
she bamsie real big, boy.
bamsie by realstylesintl March 25, 2007
A dualistic moniker -the ultimate compliment or a sly insult. It can be applied to anyone residing in Vancouver, Canada.

Usage has also been reported in Nanaimo, Canada.
"You bassie!" (said after your friend brings you your favourite brie cheese).
"That bassie!" (said about the girl who just slept with your girlfriend).
bassie by Head Bassie September 29, 2004

baesinsoh 

Polish TikToker, an K-pop stan. Has over 3 thousands followers and over 100 thousands likes. Loves her fans and makes lots of jokes on her videos. Calls her fans Besties.
- Omg are you one of the Besties?
- Yes! I love Baesinsoh!
baesinsoh by annaserioo January 14, 2021
Baecie is perfect, and nick loves her very much
baecie by Nicklovesbaecie November 16, 2014