"Diack" is a word deeply-rooted in alternate music culture. In their song "Dwarf Invasion", the lead singer of The Common Denominators says to an interuptting backup singer "Shut up, DIACK!"
"Diack" is a variation of dick. Instead of just meaning a penis, "diack" means a large penis.
"What a diack."
"Your mother sucked my diack!"
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Basically it means the same as dick but has more attitude so is quite good when used as an insult. How biatch is to bitch, diack is to dick.
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