when he's, it's, etc. at home?

who's (someone) when (he's/she's/they're) at home

humorous Who is that person? Primarily heard in UK. Robert De Niro? Who's he when he's at home? I've never heard of that actress before, who's she when she's at home?
See also: home
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

when he’s, it’s, etc. at home?

(British English, informal, humorous) used to emphasize a question about somebody/something: ‘Shirley Hills wants to meet you.’ ‘Who’s she when she’s at home?’
Farlex Partner Idioms Dictionary © Farlex 2017
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