The story
From gubber (of uncertain origin; possibly derived from gub or gob; compare gobber tooth) + tush (dialectal form of tusk). The earliest documented usage can be traced back to 1621.
Etymology from Wiktionary, CC BY-SA 4.0.
gubber-tush
Today it means: A large or protruding tooth, a tooth that is misaligned, or a tooth that stands out. Full definition →