A symbol used when conventional firearms just can't reach. The single most annoying 3-key-character in the history of the Internet. Well, maybe beside lol
A smiley used when you're so happy, you cry a tear of joy.
Sister 1: Guess what?
Sister 2: What?
Sister 1: I'M GETTING MARRIED TOMORROW! =']
Sister 2: Oh my god, I'm going to miss you!
Sister 2: But I am happy for you. =']
A smilie representing "noodles coming out of nose." The eyes are omitted. The colon represents the nostrils, while the equal sign represents the noodles coming out from the nostrils.
Person 1: :=
Person 2: wth is that?
person 1: noodles coming out of nose, you dolt!
person 2: oh, i c :=