I've been reading Thank You, Jeeves by PG Wodehouse and couldn't understand what he meant by "The man must have the crust of a rhinoceros".
Is this British slang? Can somebody explain to me what this means?
Crust in English slang means impertinence, according to Collins English Dictionary. You have to scroll quite far down to find this meaning.
YourDictionary.com gives the slang meaning as
5.Slang audacity; insolence; gall
In my comment, I said that crust of a rhino probably meant a thick hide that was impervious to subtlety or nuance; that one would have to hit him over the head with a two by four to even get his attention.
This is consistent with the dictionary definitions above, but with a slightly different emphasis. Someone with the crust of a rhino has a lot of gall, and is oblivious of how offensive he is, or simply does not give a damn what other people think.