the unofficial promotion of products or people in the media
plugola in American English
(pləˈgoʊlə)
US
noun Slang
1.
undercover or indirect payment, as to a performer, TV announcer, etc., for a commercial favor (as for favorably mentioning or displaying a particular product or brand name)
2.
free advertisement or publicity for someone or something in the noncommercial parts of a radio or TV program