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3.
When a compromise or proposal is offered between Bros in accordance with proper Brotocol, often relating to who gets which chick at a bar, or perhaps an exchange of currency for a deed requiring courage and awesomeness.
Bro 1: I dare you to ask that chick out with your pants down Bro.

Bro 2: Quid Bro Quo, I'll do it for $10.

Bro 1: I accept your Broposal.
by holmzi November 26, 2010
 
1.
To look out for one's dudes in reciprocity.
"Hey bro, have a beer!"
"Thanks, dude! You can have sex with my comatose sister later."
"Tight, dude."
"Yeah. Quid bro quo, my man."
by fingersbutts March 23, 2008
 
2.
An equal exchange of goods whether legal or illegal between two bros, a tit for a tat with a loose interpretation for the tit and tat.
Yoooo Jake, I need to make a quid bro quo with you, you come out with me and my girl and her mildly offensive looking friend, and I will roll up a fatty L tonight.
by compteezy April 29, 2010
 
4.
To look out for one's dudes in reciprocity.
"Hey bro, have a beer!"
"Thanks, dude! You can have sex with my comatose sister later."
"Tight, dude."
"Yeah. Quid bro quo, my man."
by John Witte March 24, 2008