Rainbow Stalin is a false interpretation of the lyrics in the song "Rainbow Stylin'" by Swedish electronic group "The Similou". This interpretation became a hit on YTMND featuring Soviet dictator Stalin or some form of meat loaf and rainbow lights.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)