Definition

When you're discussingcrushes, BCO stands for "big crush on." Most often, people use this acronym when telling you about their current crush. For example, your friend Jeff might say "I have a BCO Olivia," to let you know he likes Olivia.

Origin

slang.net

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When used in acronyms such ashbdandhlbd, bd pretty clearly stands for "birthday." Less commonly, some texters and online chat users may use bd as a standalone abbreviation that means "birthday."

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