An app where you film yourself lip syncing, acting and/or dancing to songs. Only cringey people still do it. It became a big trend in and died in 2016. As of 2017, Musical.ly is still available, it only died in the sense that dabbing and bottle flipping did.
Maddy: Oh my god, look at Emerson.
Emily: Is she seriously filming a Musical.ly with her iPad?
Lucy: That's so cringe.
Emily: If you think that's cringe, look at Jordan and Bonnie.
Maddy: Jordan is such a loser.
Lucy: Who still has Musical.ly? It's 2017.

*laughter*
by Jessie Collins May 7, 2017
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1.Cancer
2.The most cringey source of entertainment ever
3.A platform for children with neglectful parents.
Musical.ly is the most cringey cancerous platform for children with neglectful parents.
by The pussy slayer 666 December 12, 2016
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It is a crappy app that every update it gets worse and you meet people on there who hurt you. no one is ever truly “happy” on there anyways.
musical.ly is the crappiest app on the planet. Affirmative.
by ilooklikeaburntchickennugget January 15, 2018
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Musical.ly was an app created in 2015 (i believe). It was popular and used occasionally. The app including videos such as lip syncing, dances, duets and hilarious videos. Today in 2019, the app is now known as TikTok. TikTok is the same thing but is more up to date in 2019.
"I used musical.ly alot in 2016! I made funny videos and alot of duets."
by Bubbly Pothead October 25, 2019
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An app that all people call gay

Mostly cause of the kids on it make themselves seem gay
ANYWAY IT'S WHERE KID MAKE CRINGE

5 SECOND LIP SYNC DUMB IRRELEVANT ASS SONGs THAT ARE INAPPROPRIATE FOR CHILDREN UNDER THE AGE OF 20, DO NOT LET YOUR CHILDREN GET IT THE WILL TO INTO AAHOLLESS
Musical.ly is so gay they should call it aids.ly
by I'm a boy July 10, 2018
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