An infliction of tall guitar players who stoop to play. forming a hump back also known as guitar back.
girl 1: Seb so has a humpback
Girl 2: nah thats guitar back
Girls 3: oi humppy
3👍 5👎
When somebody does something unforgivable and irredeemable.
"Goddammit! You slept with my sister, man! Kurtzman, give me my guitar back!"