KVETCH
kvetch
(noun) (Yiddish) a nagging complaint
kvetch
(noun) (Yiddish) a constant complainer
complain, kick, plain, sound off, quetch, kvetch
(verb) express complaints, discontent, displeasure, or unhappiness; “My mother complains all day”; “She has a lot to kick about”
Source: WordNet® 3.1
Etymology
Verb
kvetch (third-person singular simple present kvetches, present participle kvetching, simple past and past participle kvetched)
To whine or complain, often needlessly and incessantly.
Noun
kvetch (plural kvetches)
A person who endlessly whines or complains; a person who finds fault with anything.
Synonyms: kvetcher, whiner
An instance of kvetching; a complaint or whine.
Source: Wiktionary