The term ghost butthole refers to the last remaining and moat ashy hit in the bowl of a pipe, bong, chalice, or other kind of smoking pipe and typically refers to marijuana smoking. When a bowl is, "cashed," or no longer contains green, it can be considered a a ghost butthole.
by Elizo Emezeta September 07, 2016
When you stealthily swim up on someone in the pool and you poke them in the butthole and then say "ghost butthole grabber... yeahhh"
by Hizzlebadizzle March 31, 2022