Definition of kvetch:
(n) :
person who endlessly whines or complains; person who finds fault with anything
(adj) :
describing a kvetch or kvetcher
(v) :
to whine or complain, often needlessly
"1969, Is this truth I'm delivering up, or is it just plain kvetching? Or is kvetching for people like me a form of truth? -- Philip Roth, Portnoy's Complaint"