1) A phrase used whenever you have nothing better to say or you just want someone's approval for no real reason. To have to work properly, one person must initiate the phrase as shown in the example.
Person 1: 'You know how it is:'
Person 2 (responds): 'The usual morning rotation'
by 323+ December 12, 2003
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1- The preferred method of asking someone if they are aware of the signs and tell-tale indications that make another aware of the person in question's homosexuality. This phrase was made famous in the movie, 'The 40-Year Old Virgin'.
PAUL: "You know how I know you're gay?"
GREG: "How?"
PAUL: "Because you have a triangle rainbow bumper sticker on your car that says, 'I like balls in my face.'"
GREG: "That's gay!?"
by PopFreeMonkey March 1, 2007
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The method of telling someone that they are gay.
Making them aware of the signs and tell-tale indications that make another aware of the person in question's homosexuality
Nelson: Dude you know how i know your gay?
Jean: How
Nelson: Because you want me to tuck my dick and nuts back and play chuck norris "fire walker" with you...Fag!

Jean: You know how i know your gay?
Nelson: How? Cause your gay and can tell whos gay in the world?

Nelson: you know how i know your gay?
Jean: How
Nelson: You are Toms number one friend on MYSPACE!
by Jean is GAY January 20, 2008
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Something a girl says after you ask whats wrong. You messed up in some way and she thinks you know about what you did. Usually done over text.
you: whats wrong?
Her: nothing....
you: oh okay
Her: You know its funny how...
by RedPanda334 October 30, 2017
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used to make someone aware that they are about to be told why they are gay. Used several times in a popular movie starring Steve Carrell called 40 Year Old Virgin
Bob: You wanna know how I know your gay?
Callum: How?
Bob: Because you got a tent when playing rugby in sports lessons . . .
by arsenalman November 27, 2008
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What the Joker says to people before telling them a story about how he got the scars on the sides of his mouth in The Dark Knight.

The first story involves his drunk father killing his mother, then cutting the sides of his son's mouth with a knife to make it appear as if he is always smiling. This is where the line "Why So Serious?" is said in the movie.

The second story is different, in which he talks about his wife. He states that he puts a razor in his mouth and moves it around, therefore cutting himself, giving himself more scars.
Story 1: Do you want to 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?

Story 2: Well, you look nervous. Is it the scars? Do you wanna know how I got them? C'mere...Hey, look at me...So I had a wife. Beautiful, like you, who tells me I worry too much; who tells me I oughta smile more, who gambles and gets in deep with the sharks. Hey...One day they carve her face. We have no money for surgeries; she can't take it. I just want to see her smile again. Hm? I just want her to know that I don't care about the scars! So, I stick a razor in my mouth and do this to myself. And you know what? She can't stand the sight of me! She leaves. Now I see the funny side. Now i'm always smiling!
by Painted in Laughter August 18, 2008
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