Top Definition
Broscience is the predominant brand of reasoning in bodybuilding circles where the anecdotal reports of jacked dudes are considered more credible than scientific research.
Broscience in action:

"Bro, you gotta slam 40-60 grams of waxy maize plus 20 grams of BCAA within 7 seconds of finishing your last set of squat rack curls. Otherwise, you'll go straight catabolic."
by Alan Aragon August 02, 2008
Broscience is apparently a term that's become more popular amongst the not-particularly-buff-but-into-bodybuilding crowd, to refer to any knowledge or wisdom that does not comport with their current, trend-based understanding of nutrition, training and supplementation.

Broscience is basically a term in skinnier people use an attempt to sound more knowledgeable about a topic, but what they fail to understand is that their reasoning is typically at least as equally flawed, and for the same reasons, as what they are criticizing.

For example, a guy may say that taking amino acids while training is unnecessary, and constitutes "broscience."

Why? Well the latest studies to come out apparently show this to be the case, and it is now trendy on bodybuilding boards to denounce taking amino acids while training as "broscience."

However, the idea of taking amino acids while training was probably brought forward in the past by other studies as well as anecdotal experience, which may contradict current studies and anecdotal experience.

Point being, studies contradict each other all the time, so anecdotal experience has a type of legitimacy that scientific studies can't completely replace. In 5 or 10 years, new studies may again show the value taking amino acids while training, and the trend while shift again.

Therefore, by their own definition for broscience, most of those using the term are in fact engaging in broscience themselves.
This is based on something I read recently on a popular bodybuilding board.

Guy on BBing board who by admission weighs 140lbs: "Wow that guy (who has trained 17 Olympic atheletes, has worked with numerous professional sports teams, and himself weighs 210+) recommends large amounts of BCAA's while training?! What an idiot! Everyone knows that BCAAs while training is just broscience!"
by 12InchGunz December 31, 2012
"scientific evidence" that is culled from magazine advertisements for various bodybuilding supplements and stated as implicit fact within bodybuilding user forums; typically prefaced with the word "bro" or shared with the "bros."
Broscience in action: ok... So I heard to take my SizeOn over a periode of time while working out.... sounds like sound advice... or does it? I have read that Creatine turns toxic after about 3-7 sec. after and depending what kind of medium its mixed in .... so why dosnt this apply to SizeOn... I havent read anywhere that it is PH balanced like the Kreacline or what ever its called.
by Slouch January 04, 2008
A body of knowledge regarding men's health substantially lacking in scientific rigor.
Broscience ranks below Jewish physics and above climate science in terms of scientific rigor.
by Uncle Gerd February 11, 2014
Word of mouth knowledge passed off as fact, primarily among bodybuilders + weightlifters. Generally spouted most by guys who have used loads of steroids and are huge, have no idea what is happening to their bodies and then share that same cluelessness with others who make the false assumption that their experience means that they have knowledge.

Watch who you listen to. Seriously. They are everywhere, sharing their knowledge - B5150.
"I never had any hairloss when I pinned the testosterone in my butt cheeks, but when I tried pinning in my bicep, I went bald" is some broscience you could find in a forum, or a gym
by EasyEJL February 20, 2008

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