From dick + sack.
dicksack (plural dicksacks)
- (slang, vulgar, derogatory or offensive) Term of abuse
2013, Elle Casey, Apocalypsis:“Shut up, dicksack! I'm in charge of the armory, you heard her!”
2018, Jo Raven, Inked Babies, page 90:“Dipshit.”
“Asshat.”
“Dickwad.”
“Dicksack.”