:3

It's supposed to be a coy internet smiley face, resembling something like a cat, cuteness in nature.

I personally think it looks like a ballsack mouth.

Woman: Meow!! :3

Man: I'm gonna teabag your ass! :3

:3

an emoji made by characters to show you are in an uwu mood

me: :3
my gf: 😉

:3

a snikkin adorable emoticon to use when u feel like amazness
it can also be typed as ;3 :#3 >:3 and many other ways

yay :3
HAHAHAHAHAH I'M SO EVIL >:3
omg i love ur hawt cheeks :#3

:3

An anime face that resembles a kitten's face, it is often used to indicate sarcasm, 'I didn't do it!' kind of thing, or seeing something cute. Some anime characters, like Konata from Lucky Star, has the kitty face. It has a colon, ended with the number 3.

Person 1: This image is so cute! :3

Person 2: I didn't post it! :3

:3

It means fuck you Josh it's not a kiss

No Josh I love you, but it's still :3 does not mean a kiss-

:3

Contrary to popular belief, this is actual a pair of balls on someone's face.

"Ballface"

Guy 1: "I'm so clever :3"
Guy 2: "haha, it's a ballsface!"

:3

An emoticon used to resemble a smile or grin that is usually expressed by anime and/or manga fans.

"Lol, I LOVE NARUTO SO FREAKING MUCH :3" (Sorry if I'm stereotyping)