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A fake three-way where the couple does it and then one of them sneaks off with the third person while the other one gets left hanging like a cheap dildo.
'I didn’t know you were doing a J-Some with Karen!' 'I didn’t either, until I got dumped for it.'
'He said it was just a J-Some, but I ended up being the leftover pizza.'
'I was the third wheel, and I didn’t even get to ride.'