Similar to "pro bono" (denoting work undertaken for the public good without charge, especially legal work for a client with a low income). Pro boner instead refers to women with low self-esteem because of outward appearance or possibly some fucked up daddy issues. Getting your pro boner in is usually done to salvage some remaining self-esteem in a girl by having sex with her.
"After she bought me that fifth shot I figured whatever... I'll just get my pro boner in, so I fucked in her my mom's mini-van out back."

"Oh him? That's Steve. Yeah, he's not bad looking but he's always on his pro boner game, swoopin' up sad fat girls. He's like a public defender but for sad fat girls..."
by Buttenlocker June 4, 2014
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It like Pro-Bono
which means being, involving, or doing professional and especially legal work donated especially for the public good
EXCEPT...
Your donating your boner for the public good... cause.. there is no use hiding it
That would just be a waste.
A:So are you going to the Club this weekend?
B:Yes, as a matter of fact I am, It's going to be Pro-Boner
by KevMack July 30, 2009
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When two prostitutes hook up and decide not to charge for their services
Prostitute 1 - So I charge $500 per hour

Prostitute 2 - I'm a prostitute too though, Pro Boner?

Prostitute 1 - Pro Boner
by Johnpricey July 16, 2019
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Helping a girl out in a messy situation with the hidden agenda of getting booty.
"Look at Marc. He's her knight in shining armour."
-Nah... He's just working Pro Boner. Pro Bono
by Sam_the_Dawg May 2, 2015
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A description of the payment method for a good or service, the method consisting of the use of you or someone else's boner, in various ways. Pro boner payment is mutually exclusive will other forms of payment, as it is offered as a form of charity. Keep the tip.
I just couldn't think of a way to pay for his legal services... Until he offered me pro boner service!
by CakeBadger April 30, 2021
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exceptionally awesome,
combination of 3 already well-used slang words
you stole a traffic cone? that's totally beast-pro-boner
by asdf+9874253 November 28, 2010
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