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To vomit violently, creating a "tidal wave of spew".
I drank so much last night, I was caught in a spewnami this morning.
by Stoink It July 01, 2010
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An ever increasing radius of nausea caused by a violent gastric eruption.

Particularly dangerous as each subsequent event could set off yet another spewnami.
Whilst coming in to land, the child got so upset it threw up, causing a spewnami to ripple and ricochet through the cabin.
by Mykatt June 08, 2014
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Profuse incident of vomiting, a portmanteau of "spew" and "tsunami".
Marie got very drunk and soaked Reg with spewnami.
by The Holy ettlz January 28, 2009
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