Top Definition
The term used when one has been waiting a while to use the toilet for a shit, but when he/she goes to the toilet, there is already someone using it, usually having a shit.

The word gazumped comes from the real estate and property market.
Ross- I've been waiting all morning to take a mega poo and when i got to the toilet, there was already someone there taking a shit!

Yash- Oh man! You've been Dump Gazumped!
by SCbear April 13, 2010

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