proposterous 

a person who streaks down one's street with no shirt on

Look at that proposterous run by!! OH MY! She has no shirt!!

proposterous by Tommy234523456 May 13, 2007

Preposterous boast, but alas 

Replacement for “weird flex but ok” because it’s overused

Random person: “I didn’t lose my virginity because I don’t take L’s.”
Me: “Preposterous boast, but alas.”

Preposterous boast, but alas by Fresh Timbs October 29, 2018

proposterone 

Proposterous amounts of testosterone

If you are pimply, hairy, and/or overly greasy you may have proposterone

proposterone by JamesOlson February 1, 2008

preposterous 

adjective meaning something that is absoloutely absurd and/or doesn't make sense.

The website preposterous.ca doesn't make any sense!
It's preposterous.

preposterous by lurker August 14, 2004

Preposterous Battle 

A battle where two or more friends compete to use the most instances of the words preposterous or preposterously.

"It is preposterously preposterous how preposterously preposterous this preposterously preposterous Preposterous Battle is, and it is preposterously preposterous when people say preposterous, preposterously, or preposterously preposterous in a preposterously long sentence.

Preposterous Battle by International June 26, 2013

Broposterous 

When a "Bro" is being preposterous.

"These 'Bro' words are getting outta hand, it's kinda broposterous."

Broposterous by badgrammir August 17, 2012

pogposterous 

The best idea anyone has ever had in the universe. It is simply preposterous that you would assume this idea is not poggers. Something so incredibly terrible that it is poggers.

"Just killed a woman... feeling good" - TommyInnit

"That's so pogposterous Tommy" - auto-generated Wilbur tweets

pogposterous by Ghostbur's Long Lost Fussy May 31, 2021