A haunting not caused by the dead, but rather by suppressed emotions, in this case a person's sexual frustration
Ruby: The entity in this house was born specifically out of Francine's sexual frustration. I like to call it a poltergasm. Gestures with his finger
Steve: What are you doing?
Ruby: I just drew a trademark sign with my finger, child, because I've registered the word "poltergasm." Any movie scripts you write based on your experiences here, Ruby gets a slice.
Buffy and Riley, under the influence of the poltergeist, were stuck having sex repeatedely without realization of what was happening outside the room like one big poltergasm.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.