Top Definition
A mans Brennan Ratio is determined by the number of spontaneous erections that man has had in the past 7 days.
Man 1: "Dude, my Brennan Ratio is off the scale"
Man 2: "Impossible, there is no scale"
Man 1: "Alright! No need to be pedantic"
Man 3: "You guys need to get laid"
by Dr. Bonana July 13, 2012

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