To describe someone who's older or getting old yet still badass or strong in their age. Derived from the prehistoric fish "Dunkleosteus" and the slang for an older person "Unc"
Tom: "Dude why'd your dad reference Metal Gear? How old is he?"
John: "Old enough to have fought in Mogadishu"
Tom: " Total Unc-Leosteus"
John: "Old enough to have fought in Mogadishu"
Tom: " Total Unc-Leosteus"
by ELRaptor08 October 14, 2025
Get the Unc-Leosteusmug.