Intense oral sex from a ghost or any other phantom-like deceased creature.
Fred: I got some good ghoulish gluck gluck at that haunted house last night.
Ted: What??
Fred: Yeah that poltergeist sucked me off real good.
Ted: Bro, are you high?
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An adjective describing someone who is so high they look like they have been deceased for 3 days.
Daaaaaamn you look absolutely ghoulish bro