The story
From third + pound + -er, modelled on quarter-pounder.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A (typically beef) hamburger sandwich, whose patty weighed 1/3 of a lb (pound) before cooking. Full definition →
From third + pound + -er, modelled on quarter-pounder.
Etymology from Wiktionary, CC BY-SA 4.0.