a form of exclamation
"your underwear is showing!" "ack!"
by christina November 11, 2003
something that you wouldn't normally do and when you "ack" , your eyes get watery
Hey! I am so ack! I just did something that I would not normally do! And my eyes are watery!
by L.M.A.O News December 22, 2008
The one word in the language exposed to the world in Mars Attacks. Can also be used as the sweet sound of music - working particularly well with the Knight Rider theme tune.
Ack-Ack-Ack-Ack, Ack Ack Ack Ack, Ack-Ack Ack Ack Ack Aaaaaaaaack.
by When Dingoes Attack October 03, 2003
The sound a girl makes when she chokes on a guys skeeze.
Guy: "im gonna cum"
girl: "ACK!!"
by NBPplaya June 22, 2006
Nonsense, ridiculous, weird, strange, unreal, to not believe something.
Ack, he's telling you a lie.
by Bear21 July 14, 2009
ack is another way of saying "meh", but it sounds german. You can say it if youre annoyed with someone. Or, if you don't believe somebody.
" Im Sorry, Please forgive me..."

"Trust me."
by Hannah December 03, 2004
The sound you make when you get your colon rammed by a one eyed snake.
Snape: Bend over, Malfoy
Draco: ACK!!!!
by AAAACCCCKKKK July 27, 2007

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