1) a catchy song that gets stuck in your head a lot. Sometimes one you don't know (evil), don't like (evil), or you know and like (happy!)

2) DJ Earworm: a DJ that creates epic mash-ups from hit music on YouTube.
The name "Earworm" comes from the definition described in 1).
"Like, OMG Baby" is an epic earworm by DJ Earwom! However, "Whip My Hair" is also.
by DJ_Earworm June 15, 2011
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A song (usually one that you don't want to hear) that plays in your head for the rest of the day after you hear it. There is often some part of the song that is addictive to the brain, which may be the beat, the melody, or the lyrics.

Best ways to get rid of an earworm include replacing it with another song, or listening to songs other than the one that is stuck (just try not to think about it).
Me: (just listening to the car radio, enjoying the music)
*Pink's "What About Us" begins to play*
Me: NOT THAT EARWORM AGAIN!!
by allam2342 January 25, 2018
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(N.) A terrible song usually made by a terrible artist that despite it's awfulness, seems to be catchy enough to get stuck in your head until the point you can't get it out. You soon start to hum it all the time, even if you don't like it and may even eventually get used to it. Earworms usually last anywhere between 2 to 6 weeks (based on how often the song plays) and occur about every other month.

Examples: Britney Spears: "Toxic", J-Ho: "Jenny From The Block", and any Justin Timberlake song after 2002.
Hey Ya isn't an Earworm. It's just a damn catchy song! Toxic, now that's an Earworm! Despite Britney's terrible singing voice, the hot, secret-agent like beat will turn it into an Earworm.
by G-Union February 2, 2004
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Term used when a song, most likely a song you don´t like, is stuck to your head !
I´ve got a fucking Earworm from this rihanna ella ella song, but i can`t remember the name !!!
by who cares abou the name?? February 23, 2009
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When you fuck someone with earstretches, and the moment your about to jizz put it through the ear and let it all explode in their face.
This douchebag performed a Spitting Earworm on me and got stuck in my stretch with his penis piercing
by Shady Viking July 14, 2014
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A very annoying mental issue. If you often wake up with your favorite song in your head and it makes it much harder to go back to sleep, you probably have it. Also, a new song would have to automatically drive out the previous one so that you have one going around up there 24/7.
My love for music has gone too far. I think I have Chronic Earworm Syndrome (CES).
by Bobuzan December 9, 2018
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When the song Africa plays on the radio once (by weezer or Toto) and is stuck in your head and It drives you nuts yet puts you in a hyperactive mood.
I can’t get an Africa - stuck out of my head- it’s gonna take a lot to take me away from you- there’s nothing that a hundred men or more could ever do! I have an African Earworm- I bless the rains down in Africa!!!
by xandroe September 5, 2018
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