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The act of installing a chevrolet LS series V8 engine into a car, normally Mazda RX-7s and Ford Mustangs. Usually frowned on by internet "car guys", despite the fact they make lots of power and are cheap.
"Oh my God, an LS swap??? That's so unoriginal, you've ruined that RX-7! You've utterly destroyed the spirit of the car!!!" 12 year old, who doesn't own a car, on a forum.
ls swap by ItsNotABloodyCooper September 19, 2017

L's syndrome 

When you muck up real bad, and look like an idiot. An undeniable idiot in front of many people and all they can do is give you that look, the "what the fuck!?" look. The 'damn this kid's a dumb ass look". Too stupid to function...
Teacher: Ian, name the world's largest country?
Ian: Ahhhh...Popeyes chicken..?
Teacher: (The what the fuck did he just say look)
Class: (damn, this kid is stupid look)

Diagnosis: L's syndrome
L's syndrome by simonJeff June 12, 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.
L.S.S. by SayaMae July 3, 2007

LS Syndrome 

LS Syndrome also known as Light Skinned Syndrome is considered a personality disorder amongst peers due to ones way of reacting in a such sensitive manner. Another diagnose of one suffering from LS is "being full of thy self" or self-centered.
Why did he react like that? He's acting mad light skinned, now i see why he's diganose with LS Syndrome.
LS Syndrome by No Cigs September 25, 2023
When my wife is jabbering on about something I dont care about, I tell her L.S.S.

Hurry up and get to the point without the boring details.
l.s.s by The Zeppelin January 15, 2005

ls syndrome 

Little sister syndrome, or the syndrome that affect people who always want to be included or to know what's going on, even when they don't understand. People with this disease love to hang around older people, even when they are not wanted. (They do not have to be literally a little sister.) Also can affect males, but it is especially insulting if attributed to them.
I must have been so annoying with my ls syndrome when I was younger. I remember I begged to go to the mall with my big sister and her friends, and then I dragged them all to the Hello Kitty store. God!

When Jenny liked that one councilor, she developed major ls syndrome. She stayed with him all day at the boardwalk, and started laughing at jokes she didn't even understand. It was so embarrassing.
ls syndrome by Tiger's Eye March 27, 2012