lily livered

Synonyms would include chicken hearted, craven coward, wimpy, woosy, cowardly puke and others.

You lily livered coward; you wouldn't dare knock this chip off my shoulder.

watash

Term used by military during the Korean War to mean best buddy, number one friend. Probably a corruption of the Japanese word for "I" or "me": watashi

Yo bocephus, how's it going? Just great, watash!