Short for Expelling Air Silently. Represents the action of being unable to stop laughing, but not making any sound, so as not to alert others to one's own amusement. Used in place of LOL
in situations when laughing out loud would be impolite/unacceptable, such as the workplace.
A friend linked me to a funny picture, but I had to EAS so my boss wouldn't wonder why I was laughing alone at my desk.