Meaning of “what's that (all) about (then)?” in the English Dictionary

british dictionary

"what's that (all) about (then)?" in British English

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what's that (all) about (then)?

UK informal

used when you do not understand why something or someone is so popular or fashionable:

Pierced tongues - what's that about, then?

(Definition of “what's that (all) about (then)?” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)