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
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
buy the domain for your diy site