A ghost rain is the asshole rain which happens while your taking a shit and by the time you get out to grab your clothes, the mother fucker stops.
by Darkhumour June 27, 2019
by Djfirehawk14 July 10, 2017
Walking or standing really close to someone you don't know who has an umbrella when its raining and you don't have one. Done in a casual way to piggy back on their umbrella without them noticing that's what you're doing.
"My friend forgot his umbrella today and i noticed him rain ghosting different people all day to keep from getting wet."
by BSWSG December 16, 2009