Killerish means something that's in the ballpark of killer — almost brilliant, borderline devastating, or vaguely intense. The '-ish' suffix does what it always does: hedges. Something killerish has killer energy without fully committing to the top tier. It's the linguistic equivalent of giving five stars but adding 'maybe more like four and a half'.
The new track is killerish — not quite their best work but it's going to bang live.
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Like or resembling a killer.
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(slang) Somewhat killer.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.