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LSS stands for Last Song Syndrome - when you just can't seem to stop singing a particular song that got stuck in your head, no matter how hard you try to sing a new one, you'll just end up singing the same lines from that song.
iPod: *singing* We ride... When we ride, we ride, it's until the day that we die.. Gawd, I can't stop singing that song. Its stuck in my head.

Zen: You just got the LSS.
LSS by Prozacboy August 26, 2007
cant get that song out of your head
LSS by Anonymous October 1, 2003
LSS can also be known as LS Syndrom. LSS stands for Love Struck Syndrome and it's when you love/lust for a guy or girl physically and/or mentally, whether you've dated them or not.
You see your bestie drawing hearts all over a piece of paper, looking distant with a odd look in their eyes

You say: Dude, do you have LSS because it seriously looks like it.

Then your bestie blushes really hard and looks away.
LSS by lovelyladyV October 10, 2012
Lead Singer Syndrome. The cocky arrogant lead singer of a band who thinks his shit don't stink and he doesn't care about his fans.
Dude, I saw those guys playin at the sports bar and I tried to by the singer a drink, but that guys got a serious case of LSS.
LSS by pseudonymtime1 July 26, 2011
LSS - or Last Song Syndrome - is when somebody listens to a particular song and keeps on humming, singing, clapping, strumming, snapping or whistling to it's tune. Most of the time, the reason why this happens, is when the song is catchy.
Lara: Pen Pineapple Apple Pen!
Felicity: Girl you just got LSS!
Lara: It's just so catchy! Even though it's stupid, it's catchy!
LSS by Entity 303 November 2, 2016
LSS - or Last Song Syndrome - is when somebody listens to a particular song and keeps on humming, singing, clapping, strumming, snapping or whistling to it's tune. Most of the time, the reason why this happens, is when the song is catchy.
Lara: Pen Pineapple Apple Pen!
Felicity: Girl you just got LSS!
Lara: It's just so catchy! Even though it's stupid, it's catchy!
LSS by Entity 303 November 2, 2016