(simile) Very happy and carefree.

Alternative form of slaphappy

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.

plural of happy hour

(idiomatic) A balanced position between two opposite extremes.

plural of happy medium

(informal) A contented, satisfied person or animal.

plural of happy camper

(Australia) Used to express displeasure at someone else's incompetence.