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Someone tells you a lot more than you ever wanted to know about their past (work, personal life, problems, etc). Too much info, too many details, not all of it is relevant or important to the present time.
When I asked about her work experience, I got a 20-minute, non-stop history dump.

If you ask about his ex-girlfriend, be ready for a history dump...he doesn't know when to stop.
by FlyingBrain March 27, 2012