sic is latin, meaning "thus" and mostly used to quote a sentence with a spelling or grammar mistake in it to show that it's not your own mistake but verbatim.

It's also a short form of 'seek' and used to set the dogs on someone.

Sick 'em is a modern misspelling that imo gives it a slightly different connotation, but still works. And it means you don't have to learn a new word, handy for lazy teenagers and people with English as a second language. It's lazy though.