By Hyperboles, Constructions

It's a somewhat vulgar expression. 'Crap' is a euphemism for sh*t; the entire construction is also hyperbole, as we don't really beat anything out of anyone.

I guess you don't get out much, Anon. Here is a sampling of respectable online sources. Doing a bit of Google research yourself will turn up many, many more.The American Heritage Dictionary: Grammarians have sometimes objected to the so-called double genitive construction, as in a friend of my...