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You heard it perhaps between someone talking to someone else, and at a moment, one of the person said : « LBTJ my friend” with a wink.
The meaning of “LBTJ” is “Look British, Think Jewish”.
Wich means “Care about your appearance and care about your money”.
It can also be used with other words like :
“Look Swiss, Think Corsican” (look neutral but plan your vendetta)
or
“Look Japanese, Think Mexican” (look like a samurai but prepare for some wild adventures).
Godefroy
