Mr Happy 

also spelt as Mr. Happy
other than the charachter of happiness in the illustrated children's book series called Mr Happy.
Mr Happy means penis

As I saw Olga Kurylenko getting a bondage in the movie The Hitman I felt the urge to shake hands with Mr Happy.

Mr Happy by Total Issues February 1, 2008

Mr Happy's Flappy Garage 

An expression used to describe a vagina.

Lianne: Are you pulling into Mr happy's flappy garage tonight? Fuels on me ;)

James: Yes.

Mr Happy's Flappy Garage by hotbitchesmotherphucker October 31, 2011

Mr. Happy 

Yet another term for dick (Penis)

A few moments after Lorena Bobbit picked up a knife, her husband soon noticed that Mr. Happy wasn't there any more.

Mr. Happy by PierreII January 13, 2009

Shaking hands with Mr. Happy 

Masturbating, jerking off

After watching Halle Berry get doggied by Billy Bob in Monster's Ball, I had to go shake hands with Mr. Happy.

Shaking hands with Mr. Happy by Ollie the Dog December 28, 2003

Mr. Happy 

An erect, happy penis belonging to only one man in the whole world. Perfect partner for Mrs. Cosy, in which he fits snuggly and (as the name would suggest) cosily.

Ryan zeelie introduced Mr. Happy to mrs cosy and this great union resulted in great pleasure.

Mr. Happy by hippykid July 20, 2011

Mr. Happy 

oxymoron- He is far from happy and feels no one else should be either. Also, never communicates with anyone what he's unhappy about, leaving all bewildered as to "what he's on about"

Speculations arise as to the general and specific sexual satisfaction of Mr. Happy, but again, due to poor communication, who knows.

"Oh look, its Mr. Happy again." "What a nutbar"

Mr. Happy by kazooie December 28, 2012

Mr. Happy 

A Figure of Speech; when the "bitch" of your group of friends decides to do something bold and unexpected of them, you can simply remind them that Mr. Happy won't be pleased.

Mr. Happy can be any form of a terrifying creature, but in this case, he is a serpent lodged deep inside a seemingly nice womans vagina. When that woman becomes enraged or disgruntled, she sends Mr. Happy to do her dirty work.

Forms of attack include severe pestering, extreme discomfort, headaches, the ability to put one in a bad mood, extreme hair growth on thighs, shoulders, and face, and on occasion; death.

"I'm going to stay up until 6 p.m. today!"
--"Peter I wouldn't want to make Mr. Happy upset."

Mr. Happy by Bukk Lao January 14, 2011