unfaithfulness to a sexual partner.
Lack of loyalty or religious belief
by Mmm SeanPaul September 25, 2003
Going outside of a monogomous relationship for sexual intercourse, companionship, or attention. Cheating.
Infidelity is a nicer way of saying my wife makes my tuna with other guys' mayonaise?
by needmaps March 08, 2012
a threesome you weren't invited to
She said she wasn't committing an infidelity, just that I wasn't invited to this ménage à trois. She promises she'll take me alpine skiing with the next guy she picks up.
by partytrap February 24, 2013
The state of being unfaithful, to either a partner, friend, co-worker, etc.
Kim: Did you hear that John cheated on Karen?
Sue: Yeah, John has some serious infidelity issues.
by suppakool#20 December 07, 2011

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