Top definition
A big deal; important. Something everyone should know, and that - by default - one should assume all others know.
Person 1: Do you know whether Bella and Sash are still dating?
Person 2: I didn't know they were together at all. I thought Sash was gay.
Person 1: Of course they were dating! Their relationship was really big zimmers.
by zimmers123123 March 14, 2011
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