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 pull

The act of one with a beard longer than 2 inches grouping many hairs on their face with one hand and pulling downwards, showing the length of their beard. Usually done in a flirtatious manner but could also be used to deter one from asking too much.

'Bro, Joe just did a beard pull, he either likes this chick or she said he was wrong about something so he needs to bide time."

by TommySalam7 June 7, 2023

White Beard

This term is used for people who have spent 9 years or more on the internet, knowing so many things about the internet, one could say they might have created it. Senior programmers also count as White Beards in some cases.

"our Grey Beard has become a White Beard."
"make way for the White beard!"

by The Unintelligent Librarian August 27, 2019

Bearded Samurai

Using your penis to "split" open a hairy vagina prior to intercourse, usually first thing in the morning.

I woke up before her, rolled her over and gave her the ol' Bearded Samurai before she knew what hit her.

by DJ Drano July 25, 2011

Vincent beard

Vincent beard (vin-sin-t / bee-rd)

When a man can’t grow a beard naturally and resorts to using minoxidil for hair growth. This results in an artificial beard that looks natural but is still fake bruh💀

“Haha , thank you 🙏 it’s all thanks to minoxidil “

“Wait , so u got a Vincent beard ?🤣”

by Moosebrah September 23, 2022

Irish beard

When a man has a beard and goes down on a woman having her period and his beard is covered in blood

My wife works till I get credit where's my said she started her period And I told her I'm ready to make my Irish beard

by Mario Snowballs February 8, 2023

beard banana

A phrase that the popular youtuber Thegamingterroriser cannot understand and constantly has him triggered when encountered. Aside from it being two words that are fun to say together, it is simply a phrase that was randomly thought up.
The general imagery created at the phrase is either a banana with a beard or someone wearing a beard made of bananas.

I walked down the street wearing and holding a beard banana.

by Tahaku December 1, 2016