Top definition
A woman, usually in her early 20s, who is gaining weight for the first time, causing her stomach area to expand. The freshly-grown skin is nowhere near the sagging stage yet; hence, it is stretched taut, and she has become a tautilus.
Look at that tautilus in the stained white tank top and pale blue sweatpants. Her stomach is almost like an extra feature to go along with her breasts and dumper.
by Bilkrik Herlop July 05, 2011
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