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you're sleeping with them, and you're not sleeping with anyone else, but they're not your boyfriend. You want to see where things go, without committing to a relationship. Somewhere between casual and serious.
Maru: So, is he your boyfriend yet?

Nancy: No, he's my boything.
by Mexi-ginge July 17, 2011
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a guy who you would consider more than a hookup, but not quite a boyfriend
After several months of casual sex followed by some serious dates, Jill saw Mark as her boy-thing, but she wasn't ready to make it official.
by Argonfire876 June 29, 2008
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