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1.
Someone who cheats, commits adultery or two-times in a relationship. In short they have affairs with one or more people.
Person 1: "Did you guys hear about Henry?"
Person 2: "Yeah he's totally two-timing Shannon with Mary!"
Person 3: "Jeez Henry is such a love rat!"
by Dear Petunia April 03, 2010
 
2.
Pete Willis
Im blatantly not a love rat at all
by Pete Willis June 04, 2003