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Short for a 'casual lesbian,' a casbian is a girl who makes out with other girls at parties or for "internet videos," or in any other casual setting. She's not necessarily a lesbian or bi-sexual but still goes for the girl on girl action on few occasions.
Bro 1 - "Dude I saw your girlfriend making out with a CHICK at the party last week. Tough break that she'd leave you for another girl."
Bro 2- "Oh it's not a big deal, we're still together. She's just a casbian."
Bro 1 - "Highest of fives to you sir!"
by loginabox22 April 16, 2011
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