Your best friend in the whole entire world!!!! You love each other like a sister. You guys have like the same exact personality and have so many inside jokes! Your just like twins. You think the same things, do the same things and love the same things! No one can replace them and everyone knows that you guys are best friends! (Unbiological sisters)! 😋 They are your only chickadee!
Hannah= my unbiological sister! Chickadees forever!!! 🐣🐥😘
by Soallen02🐣 December 21, 2013
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Your best friend in the whole entire world! You love him like a brother.
everyone knows you guys are tight. You would trust him with anything.
Hes a brother from another mother!

Hes my unbiological brother!
by Unbiological bro November 20, 2016
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Friends, roommates, or neighbors who are as close as family and fill the function a proper family should, complete with uncondictional love (and frequent bickering). A boon for those with less than happy real families. Similar to the Japanese Nakama; see Brother From Another Mother for a specific relationship.
"...and this is my sister Megan."
"Dude, aren't you an only child?"
"We're unbiological family."
by Moonlit Silver September 16, 2008
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