A Melvin 

An underwhelming male orgasm. If ejaculate is present, it dribbles feebly and apologetically out.

Did you just jizz your pants? Yes, but it was only a Melvin.
After wank number 5 that day, he realised was no longer enjoying himself, as his overworked phallus begrudgingly performed a Melvin.

A Melvin by Invasive Protusion May 13, 2016

A Melvin 

A front wedgie for a female.

My vagina just ate one side of my panties. I have a Melvin, It feels gross.

A Melvin by Wouldscrew October 3, 2022

A Melvin kid

A person who is very weak or looks like a stereotypical nerd

Wtw Sam stop being a Melvin kid

A Melvin kid by Astro Kid April 8, 2016

Caught in a melvin 

To get 4 DUI'S

That dude is going to jail again for being caught in a melvin.

Caught in a melvin by yo00092 June 23, 2009

Picking a Melvin 

When the heat is so intense that u find your balls stuck to the inside of your thigh thus having to pry them from your leg

1. I was walking down the street with both hands occupied so I had to do the cowboy kick to pick my melvin

2. I wasn't embarrassed at all to reach down in public and start picking a melvin

Picking a Melvin by ysoEZ4jsweezy January 22, 2008

you did a melvin 

In the years leading up to 2022, Melvin Capital made bets against key stocks within the USA stock market, after retail investors noticed inconsistencies with the stock, specifically the huge short position that Hedge Funds (including Melvin Capital) had accrued. Retail traders realized that these positions would at some stage need to be bought back so they independently decided to buy up the stock.

Melvin Capital essentially went bankrupt due to some very poor decision making and lack of proper risk management.

The phrase "you did a melvin" was coined in 2022 to indicate that your lost money, or made bad decisions which affected you negatively.

Jeez Kenny - you did a melvin on that trade huh?

you did a melvin by !Gary Gensler August 17, 2022

Hot Melvin with a cork 

Another word for the kind of diarrhea where the first chunk is poo, then the rest is diarrhea.

"Dude, I had some nasty Taco Bell and had to lay a huge Hot Melvin with a cork in the toilet!"

Hot Melvin with a cork by Mr. Squiggles May 3, 2005