Noun: German composer who performed over 100 operas.
To cause disdain, hatred and love amongst anyone you say the word to. Ex. I'm so angry with your right now, you damn Gluck.
Also, the spirit that enters your body after doing a shot of Jameson. Ex. What the gluck came over me, gimme another one of those.
A semi poo. Occurring when you sit on the toilet for a long period of time, and you think you put in work. Only to turn around and see one small pebble of kibble poop in the toilet.