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The little brown hard bit at the bottom of a banana.
don't eat the bonanus, rick.
by Bunnyavenger March 10, 2004
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(Noun): the bonus anal sex you give your man after he's been extra good to you. Combination of bonus and anus as well as boner and anus.
Guy- "I was so good to her this week she gave me some surprise bonanus"

Girl- "if he wants anal from me he's gonna have to earn it. Get some bonanus"
by ThatWasTheWorst May 26, 2018
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Bo-na-nus, (n.) - The boner that pokes through the anus. (See picture of Tyrannosaurus Rex skeleton for example)
My bonanus was poking through my cheeks at the gym last night.
by Futuremaestro March 18, 2019
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