Meghan Trainor performed her sassy 'Thank You' cut on Jimmy Kimmel Live! on Thursday. Meghan Trainor performed her sassy Thank You cut on Jimmy Kimmel Live! on Thursday. It's been a minute since we've seen a new performance from Trainor in a sparkly black dress, so please do enjoy. Bonus points for the streamers and choreography bop! Watch: Thoughts? Let us know in Exhale. And while you're at it... leave a comment and follow us on Facebook, Twitter & Instagram.