Ranu means anything that the speaker wants it to mean. It is a conversation filler and can replace any word. Ranu is anything and everything. It is a noun/verb/adjective rolled into one perfect word.
Chase: Dude did you get the ranu?
Kevin: Ranu bro, dont worry about it.
Chase: Alright man, ranu.
Kevin: Yea peace. I'll ranu to you tommorow.