look up any word, like eiffel tower:
A portmanteau of the words 'bestie', a diminutive of 'best friend' and 'ex', meaning former partner/spouse.
Jim: So you how are you handling being single?
Bob: It's okay. We're still best friends.
Jim: She's still your friend?
Bob: Actually, she's more than my friend. She's my bextie.
by John Gengduhbengdy May 04, 2010