E.g. Rebound Experimental Relationship
A reboundmentship is the process of leaving one relationship and entering into another very quickly. However the second 'relationship' is more or less a rebound and often ends very badly.
Often this term is referred as FB's with feelings.
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Jack: "Jill is so in a reboundmentship with Tom Thumb, she should get back with me."
Humpty: "Why should I care, I'm cracked."