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A burger so small it legally evades the guilt of eating three.

means A small, soft-bunned burger — usually sold in sets, built for eating multiple without ceremony.

from American diner slang from the early 1900s, when small steamed burgers (famously White Castle's) were said to 'slide' right through you — greasy, soft, and gone in a bite or two. Some trace the nickname to sailors and diner cooks describing how easily the buns slid across the hot griddle. Either way, the name stuck as the burgers shrank and multiplied on the plate.

origin
White Castle coined it in 1921, grease included
name theory
so greasy it slid right down
sizing
roughly half a normal burger, fully normal regret
baseball cousin
also a pitch that drops and deceives
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