Top Definition
1. Not true to one's sexual partner.
2. One of Rihanna's song.
"Im not being unfaithful to my boyfriend!"
by ThisAsianGirl May 01, 2006
Betraying your partner, disrespecting their trust. Being disloyal and not being honest. Cheating.
Kean was unfaithful, he was flirting with other girls behind mya's back
by RoastingNiggas November 03, 2015

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