1. Let's put a smile on that face!

2. A response to someone acting serious and/or angry.
1. "Do you wanna know how I got these scars? My father was a drinker, and a fiend. And one night he goes off crazier than usual. Mommy gets the kitchen knife to defend herself. He doesn't like that. Not. One. Bit. So, me watching, he takes the knife to her, laughing while he does it; he turns to me, and he says, 'Why so serious?' He comes at me with the knife, 'Why so serious?' He sticks the blade in my mouth. 'Let's put a smile on that face!' And...Why so serious?"

2. Person 1: "Halo is the best game ever, and everything else sucks! No other game is as good as Halo!"
You: "Why so serious?"
Person 2: "You never do anything right, why do I always have to do things with you!?"
You: "Why so serious?"
by Zes735 August 10, 2008
Get the Why So Serious mug.
You masterbate and then ejaculate on your hand then smear your cum across her face and say "let's put a smile on your face"
After finishing yourself off I gave her the why so serious.
by TAbresco October 31, 2014
Get the The Why so serious mug.
The phrase the villain "The Joker" played by Heath Ledger uses in the new Batman movie, "The Dark Knight" when he asks his victims why they are always so serious and not smiling.
The Joker holds a knife up to Rachel Dawes mouth and tells her the story of how he got his scars. He says that one night when his parents were fighting as a young child and he was watching from the corner, his dad asked him "Why so serious?" and used a knife to cut into his cheeks so it looked like he was always smiling.

by littlefishyjes July 19, 2008
Get the why so serious mug.
A very popular tagline for the movie "The Dark Knight". The phrase has achieved a level of popularity, earning it spots as an internet meme, several XBOX Live account names, and something for 13 year olds to put in their signatures on forums to be scary and angsty.

By the year 2018, this will be the new "Where's the Beef?!"
20 Years After the Dark Knight...

Person 1: Remember that dumbass who got "why so serious?" tattooed on his shoulder?

Person 2: Yeah, what a dork.
by gamegenie2k July 26, 2009
Get the why so serious? mug.
A soon to be classic line said by Heath Ledger in the movie The Dark Knight
Joker: "you wanna know how i got these scars?"

Scared Gangbanger: ...(mommy!) *pisses him self

blah blah goes on...and daddy says "Why so serious?"
by Infected_...Ketchup?00o0o July 31, 2008
Get the "Why so serious?" mug.
Originally The Joker's "thing" from the new Batman movie The Dark Knight. Ever since it came out idiots and morons alike have been using it non-stop in an attempt to be cool and "edgy".
"Lolololol why so serious? tonite ppl gon di!!111oneSHIFT"
by irjga;dilfujgv;jra;vi August 6, 2008
Get the Why So Serious mug.
The most popular phrase from "The Dark Knight". used by fanboys and the genuinely joker-like characters alike. Although its a cool thing to say, say it to much and someone may punch you in the face.
idiot- lulz! i wa7ch3d teh joker l4st n1ight on HB0 and 4lm05t 5h!t mahself!!!

cool joker fan-you should start taking things a little more seriously

idiot-Why so serious? LOL

cool joker fan-*punches idiot in the face*
by footballer88 February 25, 2010
Get the why so serious mug.