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1.
Famous opera singer who is neither Pavarotti nor Domingo
ELAINE: Who else is on the show?

JERRY: Uh.. one of the three tenors.

ELAINE: (Interested) The Three Tenors? (Stands up) Which one?!

JERRY: Uh.. It's not Pavarotti.. It's not Domingo..

ELAINE: (Extremely excited) The other guy?!

JERRY: (Nodding) Yeah, the other guy.
by enroiv March 19, 2010
 
2.
The guy who a taken girl has been cheating on her boyfriend with.
guy a's girlfriend has been fooling around with guy b, making guy b the other guy.
by krispekremy November 09, 2008