Top Definition
When a dick is not hard but its not soft. It is basically a boner that you can flex.

Usually you get a flex boner when drunk.

Can also be referred to as a flex-b.
I was so tanked last night, I couldn't even have sex because all I had was a flex boner.
by Zach2k8 March 12, 2008
5 Words related to flex boner

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