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Literally "walking whale", it's a mean-spirited way of describing an obese person. Essentially, it's a stealthy or mocking pseudo-technical way of saying "landwhale".
Did you see that ambulocetus who waddled into the store the other day? She must have weighed 400 lb!
by apStone July 05, 2011
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An ambulocetus is an incredibly fat person. This person is beyond whale fat. the term comes from the /fit/ board on 4chan. an ambulocetus was a large land mammal that evolved into whales. it has been called the walking whale, so fatasses are now called ambulocetus's on /fit/
by Concerned /fit/izen July 02, 2011
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