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1.
(MATHEMATICS) a number consisting of a real number and an imaginary number; imaginary numbers are multiples of the square root of -1.
You need a complex number to express the value of an electromagnetic wave function.
by Abu Yahya April 23, 2010
 
2.
A euphemism for fake breasts used during conversations in which the subject or subject's friends may be able to hear what is being said.

Derived from mathematics where complex numbers are those that are not real (like the breasts.)
Holy shit check out those complex numbers!
by qukkie July 14, 2008