ACK 

an exclamation of shock, surprise, or disappointment to be used mainly by awkward individuals

"ACK! I left my wallet at home!"

ACK by mylifeisawk May 2, 2012

ack 

Short for acknowledged. When a person says something that doesn't require a response, but the person wants to let them know they recieved the message. Similar to okay, but when using okay just won't do.

Sanford: I had cheerios for breakfast today.
Stephen: I don't care
Sanford: Ack

ack by JesusPirate August 19, 2010

Ack 

Ack means any swear word that you can think of.

"You can go ack yourself!"

Ack by Phoenix_Slayer 565 February 8, 2018

Ack 

Nerdspeak for "yes" or "I hear you"
Usu. used on IM by programmers

"Is the latest patch on the source server?"
"Ack"

Ack by mistervague November 8, 2003

Ack 

In the TCP protocol, the receiving computer sends an ACK (acknowledgment) to the sending computer. This is basically how a coonection is established.

Sender sends 3 packets, Receiver receives 3 packets and sends "ACK 4" (meaning it received what was sent, and it's ok to send the next number or packet)

Ack by Obi-Wan December 9, 2003

Ack 

The natural sound someone makes when choking

Person 1: ACK ACK ACK
Person 2: Are you ok?

Ack by Still chill still chill February 21, 2020

Ack 

airport call letters for Nantucket Memorial Airport.

Common abreviation for anything Nantucket.

Ack Attack - Have to get to Nantucket for vacation

Ack by Chris ACK June 15, 2005