name for some types of freshwater terrapin in southern U.S., 1835 (first attested 1827 in phrase drunk as a cooter, but this probably is a colloquial form of unrelated coot), from obsolete verb coot "to copulate" (1660s), which is of unknown origin. The turtle is said to copulate for two weeks at a stretch.[cooter etymology, cooter origin, 英语词源]