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
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