A greeting used during Halloween to recognize its celebration

Content; having one's wants and needs met. / Used other than figuratively or idiomatically: see fat, happy.

plural of happy place

(idiomatic) A mental visualization of a pleasant location, to avoid thinking or dealing with something unpleasant or painful.

(slang) nitrous oxide

(slang) The clitoris. / (slang) The prostate (in relation to sexual stimulation through the rectum).

(set phrase, hyphenated when used attributively) Lighthearted, pleasant conversation; upbeat banter; optimistic remarks.

(informal) many happy returns

(Britain) A children's card game played with a pack of 44 picture cards that depict a father, mother son and daughter of 11 families mostly having occupational surnames (e.g. Mr Bun the Baker); players have to collect entire families

(literature) A clichéd conclusion in which all loose ends are tied up and all main characters are content.