Top Definition
Two siblings that make love to each other.
Did you hear about jon and javy? They've secretly been having sex... They're ferfin fiblings!
by jeebroo duh hebrew March 22, 2013
A friend whether a boy or girl that is so close to you, it like you're siblings with different parents.
• She's not my best friend, she's my fibling.
• They're not my friends, they're my fiblings.
by Julia Doe November 06, 2015

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