A Two Time
When someone tries to juggle two relationships at the same time and lies like a fat kid on a donut diet. They usually blame you for the mess and act like they're the victim.
Hey, you're still with that girl? You're also with the one from the gym? What's the deal? You're a lying sack of potatoes!
He says he's with me, but he's also with the barista. He's a two-timing loser!
She had the guts to tell me he's with three people. I'm going to beat him up and then tell her she's a two-timing witch.