A woman/gay man who is sexually off-limits. The restriction is self-imposed.

Includes victims of trauma (eg was recently assaulted), sexually transmissable infection, bro rules (eg your bro's sister but you can't contact him to get permission), psychopathy (eg "sex-is-love" disorder).

From the word form "no-brainer"
Bambi was looking totally hot last night but she was on her rags so it was a total no-boner.
by Matti! Matti! Matti! January 03, 2011
Similar to "no-brainer", when a chick is so fine, you don't even need to think with your wang before you to take her to bed.
jim: i heard you scored with that lainey girl last night, very nice.

bruce: she was lookin' damn fine and making conversation with me, it was a no-boner really.
by DAAW July 30, 2008

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