Wag

Verb

1. To swing from side to side
   esp. of an animal's tail
   See also wiggle
2. (British slang) To pretend to be ill in order to shirk a responsibility, usually school lessons.
   Corruption of the latin aeger, meaning ill.
   See also skivitis

Adjective

1. Pretending to be ill, as in 2 above. Also 'wagging it large'

Noun

1. Witty person