An expression of sarcastic pity or sympathy.
Person 1: Like, oh. my. gawd. I broke a nail!!! I'm, like, dying!
Person 2: (sarcastically) Awww, I'll tie your shoe at your funeral.
an expression of irritation when someone acts overly dramatic in a situation
Person 1: OMG!!! I forgot to study! *faints*
Person 2: Oh, try not to die!
n. A character in a science fiction show, who dies soon in the episode. This character often acts nonchalant or sometimes even cowardly. Often their name is only mentioned in passing, or are given no name at all.
Taken from characters in Star Trek who wore red shirt/jackety things.
Random guy: What could possibly go wrong?
Other character: Ooooh, he's gonna be a red jacket...