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

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

race beard

A token BIPoc person you are friends with so you don't appear racist.

See also: queer beard

"We need more diversity in our friend group. Shall we invite Steve?"
"Steve? Oh, you mean the black Steve!"
" Dudes, Steve knows you're using him as a race beard, eh."

by secretuser420 May 7, 2022

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

Toby Beard

Annoying mf who eats mc wraps 24/7 and defo fancies erin white

Wow, toby beard is broke as fuck! hes defo not made a trench outing game.

by prestige light skin October 9, 2022

Velcro-beard

When you have a short beard and like velcro it catches onto things like hair, your shirt, and other clothing. It’s usually painful.

I love hugging my son, but he always gets velcro-beard in my hair.

Ouch! I keep getting velcro-beard in my sweater.

by I_caveman August 21, 2019

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