Green Beard Altruism

Greenbeard altruism is a fascinating concept in evolutionary biology that attempts to explain the evolution of altruistic behavior. It proposes that a single gene (or a set of tightly linked genes) can be responsible for three distinct traits: a noticeable signal or "tag" (like a green beard), recognition of that signal in others, and altruistic behavior directed towards those with the same signal. This allows individuals to selectively cooperate with others who share the same gene, even if they are not related. 1 While the "green beard" example is hypothetical, there are real-world examples of this phenomenon in various organisms, highlighting the potential for cooperation to arise through mechanisms beyond kin selection.

Green beard altruism, while theoretically possible, is rarely observed in nature due to the complex requirements of a single gene controlling the signal, recognition, and altruistic behavior.

by The Counterintuitive Words February 10, 2025

beard scrunch

A beard scrunch occurs when someone with a beard rubs their beard on someone else.

Dan gives me q beard scrunch whenever he hugs me

by maninahat June 4, 2021

Bearded Know-It-All

A stereotypical social media commentator, usually with a beard, who likes to hear themselves speak as if they are an expert on a given subject, but their expertise might be questionable.

The bearded know-it-all gave me an unsolicited lesson on what he thought was the proper way to drink bourbon.

The bearded know-it-all mentioned on his podcast that birds are direct descendants of dinosaurs.

The bearded know-it-all argued that there is no difference between micro and macroeconomics.

by Rev Possum Jenkins July 16, 2025

The Beard Principle

If you kissed, your facial hair will start growing faster and stronger.

Man 1: wow! Since when u gout this beard?
Man 2: oh I've kissed last week
Man 1: oh, so it gotta be The Beard Principle!

by Thenutmaker June 18, 2021

bearding off

When you eat pussy with a beard and the pussy juice gets all in your beard. It smells so good the next day you smell your beard to jerk off.

Patrick was bearding off this morning

by Resin factory September 25, 2020

The Beard

to lick a Vagina out. the definition derives from going down on a bird, and her vagina lips are covered in hair, hence a similar sight to a mans face and facial hair

'Gees Schwerdty i heard you put the beard that bird, last night how was it?'

by Choppin Grove March 12, 2009

fart beard

The significant other to which a man or woman blames an obvious fart (noun); to blame a self-made fart on a significant other - or possibly a family pet (verb).

Hey now, don't beard that fart on me bebe - or -He was cool to claim the blame, but I was sitting next to her - I think he was her fart beard.

by mfrogz June 30, 2015