gack /ɡæk/verb 7exclamation 4noun 2forms 3 verb7 •To make a sharp, sudden sound in one's throat, such as before vomiting or while coughing, gagging, etc.Then we hear the unmistakable gacking of a dog about to puke. Ooah. Ooah. Ooaah... And puke Loki does, right under the coffee table. — 2015 •To do something that causes a sharp, sudden sound in one's throat. •To choke (be unable to breathe because of obstruction of the windpipe)[…] Chutsky came around and kicked the other one in the throat, so hard I could hear it crack, and he went over backward making gacking noises and clutching at his windpipe.u — 2010 •To vomit, throw up.I mean, if cheese could make me gack, you know that poop snake, coiled around that worthless pen, wasn't going to calm my jumpy stomach down. — 1996 •To choke (experience tightness in one's throat as a result of strong emotion)My throat made some gacking noises, though. No, no crying! Stiff lip, stiff lip, stiff lip—you got an interview! I stood in the kitchen, shaking and swallowing everything down. — 2010 •To cough something up. •To call in response to disturbance.During a disturbance the young run to the water and dive from fear, […] On other occasions the adults swim or walk about, incessantly gacking. — 1977 exclamation4 •A sharp, sudden sound from someone's throat while they're coughing, vomiting, gagging, etc.Gravity does the rest as Jane's vomit spills back into her trachea. Guck-guck-^([sic]) GACK...guck-gack....GACK! GACK!...GACK! — 2016 •An expression of disgust or disapproval. •An expression of trepidation.“Gack,” said Judith. “I don’t remember that. I wish you hadn’t. […]” — 1995 •The sound of a bird's call in response to disturbance.It was a big downy chick, about twenty-three days old. […] Steve shot ptargmigan for it, and every time it ate or saw Steve it would scream, Gack gack gack gack, […] — 2009 noun2 •(slang) Powder cocaine.Getting gilled on gack without the precious reward of a drink on top, though, really sucked. Alcohol was my great love. Cocaine was just something I did to keep my altitude up […] — 2009 •(slang) Crystal meth. formsgacked · gacking · gacks