Not to be confused with asterisk expression. Asterisk expressions run along the lines of: *sigh* *cough* or *sneeze* If you were to add an "s" to any of those, it would be an action.
User: Hai guyz, what's going on?
Troll: "LOL ur wrong im right"
User: *farts on*
Troll: What's an Atari and how the hell was it the "original" console? Xbox was the original console!
User: *punches face*
Troll: LOL launch missile!
User: *Kirk hand chop*