BCO
Big crush on
Example
I think she has a BCO Steve
Steve?! Really?!
BCO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BCO" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When you're discussing crushes, 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.
You might also encounter BCO within gossipy conversations about other people's crushes. For example, if your BFF knows that your mutual friend Laura is interested in you, they might say "Laura has a BCO you, BTW."