A person of the trades (auto mechanic, carpenter, plumber) who knows virtually everything about his particular line of work, but little to nothing about anything else. This can include life itself. While not considered a derogatory term by any means, it *implies* said person would do well my expanding their horizons.

The act of passionate copulation with a woman (typically a sex worker) from the Far East

When blacks and whites have kids you get yellowhammers.