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To perform auto fellatio on oneself with your legs spread as far as possible, you reach out and grab your feet so that it looks like the wings of an old bi-plane.
Holy fuck, Dougie Fresh is giving himself a Biplane!
Biplane by shavedyeti March 10, 2010
A sexual act that requires 2 men and 1 female. One spins a figit spinner on his penis while one stands behind the one with both of their arms extended. Both men make plane noises while running until they reach her vigina
I just got the best Biplane last night!
Biplane by Dinoman127 January 29, 2018

birthday cake biplane 

One is said to be "riding the birthday cake biplane" when he or she is extremely high on cannabis.
Steve, are you riding the birthday cake biplane again?
birthday cake biplane by yagotbutts December 14, 2011

riding the biplane 

to be on the fence about one's sexuality.
Is Rick gay?" "No, he says he is straight...but we think he is." "Oh, he must be riding the biplane.
riding the biplane by The Stewardess September 11, 2010

Alaskan Biplane 

When two very hairy men with small penises put both penises in a large condom together and have regular sex
Two men, One women, One large condom, and balls touching is all that is need for a Alaskan Biplane
Usually associated with one or more people who are extremely badass and awesome. People that wake up in the morning and piss excelence.
person 1: "Man that dude is so awesome."

person 2: "I know he's so biglane!"
Biglane by MyOwn September 10, 2009