x — the 24th letter of the English alphabet, a consonant.
bar — A bar is a place where you can buy and drink alcoholic drinks.
baz — (computing) A metasyntactic variable used to stand for some unspecified entity, typically the third in a series after foo and bar.
foo — (computing) A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.
fred — Antoinette, 1888–1946, U.S. actress, theatrical manager, and producer.