A non-transgendered male. A naturally-born man or boy whose psychological gender identity is socially male also.
Clarification: A cis male is not necessarily macho, or even of average masculine persona. A cis male might have some or many characteristics that are feminine, effeminate, or female-like, but unless he seeks to project a female persona, he is still a cis male.
Liberace's sequined robes and feather boas might remind us of a drag queen, but he was still a cis male.