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big bird boner 

An extremely large boner that is not able to be hidden under any circumstances. Approximately 9001 times the size of a Nathan.

see definition Nathan

Nathan-
A term used to describe an especially perky boner in public that is unable to be hidden.
"Sam, I was in the office reviewing papers when I noticed a female who had an incredibly attractive body. I instantly had a Nathan, and when she turned around, her face was just as magnificent as her body, at which point my Nathan turned into a BIG BIRD BONER."
big bird boner by Flibbert February 8, 2010

Two Birds, One Bone 

Slang for a mff type threesome. Nearly every man's fantasy.
Derived from the common phrase "killing two birds with one stone".

Bower bird 

A female who is in a threesome with two gay guys. She is wanking them off while they are kissing above her.
Last night the boys fully bower birded me!
Bower bird by Mikarly November 17, 2019

bower-bird bed-buddy

A considerate dude who frequently/diligently tidies/smoothes/re-adjusts the blankets/pillows while canoodling in bed with you, just as the well-known feathered grass-walled-nest dweller does to please a female who drops in to visit.
Tiffany always appreciates my being a bower-bird bed-buddy, since it feels so much more pleasant to sleep with me if the blankets are always neat and uniformly covering us, especially during the cooler seasons.
bower-bird bed-buddy by QuacksO August 22, 2018

Bird Bones

a condition in which a person cannot take a ribbing from a close friend. the person receiving the playful picking commences to whine and cry like a little baby bird until everyones in a bad mood.
we were gonna tease braden about getting fired but he's got brittle bird bones.