the.com/beast

means An informal way to call something or someone extraordinarily impressive, intense, or skilled — the superlative that skips straight past 'great.'

from From Latin 'bestia' (wild animal), through Old French 'beste' into Middle English. For most of its life it just meant animal, especially a large or dangerous one — think 'beast of burden' or the monster in 'Beauty and the Beast.' The slang flip is recent: by extension, something fierce, powerful, or untamed in nature got applied to anything dauntingly impressive — a 'beast' of a workout, a player who's an absolute 'beast' on the field. Same old wildness, just pointed at excellence instead of claws.