boner

Noun

Singular boner

Plural boners

1. (vulgar); (slang) If you get a boner, then your penis becomes hard.

   My girlfriend asked me what it was like to have a boner because she's never had one.

2. (vulgar); (slang) A boner is another word for a stupid person.

   I guess I'm the smartest person in the class because I'm the only one who isn't a complete boner.