Meaning Hold on a second
Type Acronym
Popularity ★ ★ ★ ★ ★  Popular
Usage Online Only (chat, messaging, e-mail)

HOAS stands for "hold on a second", which is used when someone needs to step away from the computer for a little bit. It does not literally mean one second as it can be a couple seconds or minutes.

The HOAS acronym comes from the saying used IRL, which is commonly told to impatient people. It is also similar to the "wait a second" phrase.

Example "HOAS, I need to pick up a delivery at the door. BRB."
Updated July 29, 2016
Meaning Heck of a shot
Type Acronym
Popularity ★ ★ ☆ ☆ ☆  Uncommon
Usage Online Only (chat, messaging, e-mail)

Means an amazing shot, as opposed to just a good shot (GS); often used in online billiards play or other games.

Updated January 2, 2014
Information from PC.net