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1.
To throw up violently - as described in the viral video hit "Gap Yah". Usually, the recounting of such a "chundering" will be punctuated by a great many less-than-savoury details on the subject.
"Yesterday, I was led out onto the parade ground... and then I just CHUNDERED EVERYWHERE, we'd been on the lash the night before."
by -God....... April 15, 2010
 
2.
In kayaking, rafting, canoeing, and catarafting when a person and/or their craft is thrown about violently in a hydraulic feature of a river for a long time. Long time, being a relative term referring to longer than you can handle, which can be less than 15 seconds. Usually the craft is recirculated back into the hole several times, leading to a feeling that escape is impossible. Characterised by a complete loss of perspective with respect to the world and commonly followed by a swim.
I totally got chundered in that hole.
Dude did you see that punter raft get chundered in hellhole.
by Ivan Orion October 21, 2007
 
3.
Anything that's demolished beyond repair.
"Dude, I had a blow-out on my bike and my tire was chundered."
by lisa wachs August 20, 2007