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.
by Prozacboy August 21, 2007
Long Story Short. This is the proper definition and easier to use when texting someone on the phone...
LSS i.e. Long Story Short, I will be late...
by Everlast May 24, 2005
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.
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.
by pseudonymtime1 July 26, 2011
(noun) L.S.S- Last Song Syndrome: when you continously hum or sing the last song you heard.
My mom had a case of L.S.S. this morning as she continously sang the last song she heard on the radio, "Livin' on a Prayer" by Bon Jovi.
by SayaMae June 08, 2007
cant get that song out of your head
by Anonymous October 01, 2003

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