Something that sizzles (makes a hissing sound when hot), or informally, something exciting, hot, or impressive.
From the verb 'sizzle,' which is an imitation of the sound made when fat or liquid hits a hot surface. The -er suffix creates a noun meaning 'something that sizzles' or 'something exciting.' The onomatopoeia has been in English since at least the 1600s.
The sizzle sound happens because liquid instantly turns to steam when it hits a surface hotter than 212°F, and the rapid phase change creates those tiny vibrations in the air—which is why sizzling has become slang for anything with energy and heat, from music to sports performances.
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