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When twins have sex or perform sexual acts.
It's a combination of the word Twin and the word Interaction; the twins "interact" sexually with one another.
"I'm so hot. I wish I had a twin so we could have some twinteraction. We'd never leave the house."
Twin + interaction. This is a phenomenon in the video game Phasmophobia (2020) where The Twins ghost type interacts with the environment in two places simultaneously.
It is easily seen on the activity monitor when a line changes its angle midway before it plateaus. This pattern strongly suggests, but doesn’t confirm, The Twins’ presence.
We experienced a Twinteraction firsthand when we observed two objects moving at the same time!