Old Man Yaoi is a specific brand of Yaoi- Japanese gay erotic/romantic manga, in which the two characters in love are old. More often people use the term to describe fiction relationships containing old men that are from other types of media.
Person 1: "What are you reading?"
Person 2: "Oh, it's Hilson Mpreg Fanfiction. They're my favorite Old Man Yaoi."
Person 2: "Oh, it's Hilson Mpreg Fanfiction. They're my favorite Old Man Yaoi."
by yaoiyurisnorterguuuuulp January 3, 2025

Mid afternoon, when a wave of tiredness just overwhelms you, take an OMK… Just like a Siesta really…
by Count Shillitoe May 29, 2022

Dresses as if he's on vacation 24/7. Hawaiian shirt or similar, shorts usually kaki, cheap sunglasses
"My Dad looks like he's on vacation 24/7."
"-You mean he has the old man uniform down."
"Yeah, he looks comfortable though."
"-You mean he has the old man uniform down."
"Yeah, he looks comfortable though."
by panipilot April 30, 2015

When a person acts as they comprehend what are you saying, then walk away and they did comprehend at all. They repeat the information incorrectly.
by Abbysworld April 10, 2021

by Iodop May 6, 2009

(1)Complete reversal of previous positions on important or trivial matters affecting everyday life ... normally but not necessarily appearing when one turns 50+ ...
(2)Suddenly giving up on previously held beliefs ... Flipping-flopping on a given issue ...
(2)Suddenly giving up on previously held beliefs ... Flipping-flopping on a given issue ...
Bob is a peace activist his entire life, but while on his death bed, he decides that conflict is a necessary action of humanity, he is obviously suffering from "Old Man Derangement Syndrome".
Fran is a life long Republican, but when she turns 60 years old, Fran becomes a Democrat, throwing away long .held political beliefs.
Jim believes in marriage being between a male and female, but in his later years of life, decides marriage can be between a male and female, a male and male, or a female and female.
Fran is a life long Republican, but when she turns 60 years old, Fran becomes a Democrat, throwing away long .held political beliefs.
Jim believes in marriage being between a male and female, but in his later years of life, decides marriage can be between a male and female, a male and male, or a female and female.
by HatesOldManFlipFlopping November 9, 2012

When a non-adult male ( between the age of 12 to 18) is flirting a female of the same age or younger ,like a 40 year-old business man would.
Boy 1: bruh I am trying so hard to show my feeling to my crush but this fuckboy dude is so much better
Boy 2: so he is 40 year old man flirting her .
Boy 2: so he is 40 year old man flirting her .
by TrippyWanderer23 March 24, 2020
