(idiomatic) A period of time, imagined never to end, in which (typically) a loving couple live untroubled, happy lives together. / A story with such a happy ending, such as a romance novel or fairy tale.

(idiomatic, often preceded by "they lived") Happily until death; used in a formulaic ending for fairy tales.

(simile) Extremely happy and carefree

(simile) Very happy and carefree.

Alternative form of slaphappy

plural of hapax

plural of accident waiting to happen

Money can purchase external things, but true happiness comes from within oneself.

Said or written to a person who is celebrating his or her birthday in order to convey the good wishes of the speaker or writer (literally, "may you have a happy birthday")

(colloquial, transitive) To wish (someone) a happy birthday.