1 definition by Lauren of Arabia

Top Definition
A carnivorous marine animal, similar in appearance to its land-based cousin the emu, though with brownish scales instead of feathers. Lives on krill, rainbow trout and unwary swimmers.
Kevin was warned not to go in the water that day, but he didn't listen. When he didn't return, his girlfriend assumed he had been eaten by a seamu.

"No way I'm diving on that shipwreck, it's teeming with hungry seamus!"
by Lauren of Arabia March 24, 2009

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