The Collaborative International Dictionary
Cack \Cack\ (k[a^]k), v. i. [OE. cakken, fr. L. cacare; akin to
Gr. kakka^n, and to OIr. cacc dung; cf. AS. cac.]
To ease the body by stool; to go to stool.
--Pope.
Douglas Harper's Etymology Dictionary
"act of voiding excrement; to void excrement," mid-15c., from Latin cacare (see caca). Related: Cacked; cacking.
Wiktionary
Etymology 1 n. 1 A squawk. 2 A discordant note. vb. 1 (context of a bird English) To squawk. 2 (context brass instrument technique English) To incorrectly play a note by hitting a partial other than the one intended. Etymology 2
n. 1 An act of defecation. 2 Excrement. 3 Rubbish. vb. 1 (context intransitive English) To defecate. 2 (context US slang English) To kill. Etymology 3
vb. (context Australian slang English) To laugh. Etymology 4
n. (context slang English) penis.
Wikipedia
Usage examples of "cack".
Mickey thought, For the past three days I've been in a living hell, expecting to get cacked at any minute.
Ya anticipate everything ya can, ya avoid the mistakes ya made in the past, ya figure what the other guy might do, will do, can do and then ya take yer chances, knowing that if everything goes right, ya could still get cacked and if everything goes wrong, I mean if ya totally screw it, ya could still walk away without a scratch.
Since when did we start to believe the cack Research and Development hands out?