a suffix of nouns that refer, usually derogatorily, to persons who support or are concerned or associated with a particular political cause or group, cultural attitude, or the like: beatnik, filmnik; no-goodnik; peacenik.
Origin: < Yiddish (cf. nudnik) < Slavic: a personal suffix in Slavic languages in contact with Yiddish
as in beatnik, etc., suffix used in word formation from c.1945, from Yiddish -nik (cf. nudnik "a bore"), from Rus. -nik, common personal suffix meaning "person or thing associated with or involved in" (cf. kolkhoznik "member of a kolkhoz"). Rocketed to popularity with sputnik (q.v.).