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1.
A person who suddenly begins to spend an unhealthy amount of time with their significant other, and shows a disinterest in activities that they once enjoyed. They may exhibit qualities such as lying, breaking promises, and other such symptoms.
Katie is such an übertül, she spends all of her waking hours with her boyfriend.
by James Randolph March 03, 2005
 
2.
A person whose warped sense of reality causes them to spend abnormally high amounts of time with their significant other, and do things for them that they would not typically do under normal circumstances.
Nancy is such an übertül, she spends 10 hours a day with her boyfriend.
by James Randolph March 03, 2005