Songfacts®:

• Meghan Trainor's second single is a sassy tune that finds the singer breaking up with her cheating boyfriend.
  
  I know you lie because your lips are movin
  Tell me do you think I'm dumb?
  I might be young, but I ain't stupid
  Talking circles with your tongue
  
  Though the song is not all about her bass, it is another doo-wop throwback in a similar vein to Meghan's breakthrough single.
• The song's music video finds Meghan belting out the soulful tune, flanked at times by backing dancers in front of several colorful backgrounds. "It's not just a story or a theme of 'here's a boy and here's me and me yelling at him,'" she explained to MTV News. "It's like, 'Here's me being sassy and other people dancing with me and having just a good time and trying to get through this feeling of, Ugh he's cheating on me again.' Like, 'I know you're lying, but that's OK because I'm gonna find the next guy. I'm good.'"
• The clip features props being lifted on and off screen by various workers. Did you recognize any of them? Several Vine, Instagram and YouTube stars have cameos in the video, including Marcus Johns, Chachi, Les Twins, Robby Ayala and Cody Johns. In addition the chorography, set design, hair and makeup, styling and behind-the-scenes photography was all done by the social influencers.
  
  Meghan is a personal fan of many of her co-stars. "Les Twins are incredible, I watch their videos all the time," she told Billboard magazine. "I have been following Marcus and Cody Johns since their first Vine, and Mei -- who did my nails for the video -- is so incredibly talented."
  
  "I'm excited we were the first to make a music video this way, by tying in all the innovators and influencers," Meghan added. "But it still feels very 'Meghan Trainor,' which is amazing!"
• Meghan Trainor wrote this in just eight minutes with her writing partner Kevin Kadish. She recalled to Q magazine: "That was scary. I remember looking at the clock and thinking, 'Hang on, we just started it at this minute, now we're done, so how is it this minute?' We just freaked out."
• Like "All About That Bass," this song also has a retro sound and uses the same basic structure, starting with the chorus and then going verse/chorus/verse/chorus (B-A-B-A-B).
• The song actually grew out of Meghan Trainor's frustrations with her record label, rather than an unfaithful lover. Kevin Kadish recalled to Bart Herbison of Nashville Songwriters Association International they'd actually finished the Title album but had an extra day together, and Trainor's A&R guy encouraged them to keep writing. Kadish put on a track that he had already started for the record while Trainor was on a conference call. She could hear it playing through the headphone box and the singer banged on the glass, and told the producer, "That's what I want to write today."
  
  Kadish knew the whole situation of what was going on with Trainor and her record label, so while she was on her conference call the producer sat at his computer writing, "I know you're lying, your lips are moving." By the time she walked back into the room he had a bunch of lyrics written down. She loved what Kadish had done and started singing the verse. According to Kadish this all happened in eight minutes.