The phrase combines a familiar Japanese family name, Sakamoto, with dasai, a long used Japanese slang word for something uncool, tacky or behind the times. Short clips built on a single insult travel well on soundboards because they need no scene, character knowledge or subtitles to work as a joke. This one has settled into use as a quick roast sound, shared between friends and dropped into edits whenever someone does something awkward, wears something questionable, or tries too hard and misses completely in public.