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Little Shit Syndrome: Whenever a little kid is acting like a brat and just won't stop.
All the younger middle-schoolers push each other in the corridors and down the stairs with no respect towards anyone; they have fucking LSS!
LSS by Kikoman589 October 26, 2016
so lss, we kissed
lss by Clics March 13, 2017
Lss by anonymous December 20, 2020

LSS (Lethasynaptic Syndrome)

A mental state of mind often related to laziness, fatigue, and severe procrastination, affecting responsible behaviour and most higher thinking processes.

Symptoms include:
1.avoidance of studying or doing homework
2.preference for involving oneself in entertaining or even mundane activities in order to avoid using any higher intellectual thinking processes.
3.tendency to procrastinate or leave work to the last minute
4.preoccupying oneself by surfing the internet, and lingering on sites such as Facebook, Youtube or Twitter, often refreshing the page for something new to pop up in accordance with the first three symptoms above.

*University and senior high school students are at a high risk to this mental disease.
"One day I realized that even though I'm sick of everything else but homework, I still won't do it. I know that I have to do it, but for some reason, I'm not compelled to do it!"

"Dude, I have the same thing as you!"

"No way! Seriously?"

"The doctor told me it was LSS (Lethasynaptic Syndrome). It's a DISEASE."

LSS (lead singer syndrome)

The act of having a big ass ego and thinking that you are the biggest turd since bono just because you are in a band that plays at a fucking teenager's club.....zing
Seth: Wow joseph really is a big dick
Chance: ya too bad he dont have one
BOTH: hahahaha
Seth: ya he really has LSS (lead singer syndrome)
Chance: whats that
Seth: lead singer syndrome
Chance: ya he is a queer....zing

LSS Effect 

Phenomenon when object and/or personal belongings mysteriously disappear and are not found until requesting assistance from LSS to help locate it. Thereafter LSS finds the item (often hidden behind other objects) and makes you seem like a total dolt. Typical items that disappear include keys, postal mail, and pots or pans. The LSS effect has been recorded in several places, most commonly the kitchen and Ed's workbench.

Victims of the LSS effect have 99.9% certainty that they did not move the item that they are trying to locate. Victims usually report symptons of confusion, overheating and inevitable rage when they are unable to locate their item.
ED: "Where's that whisker for the pancakes? I know it was right here before"

Me: "Oh god it's the LSS effect again..."
LSS Effect by admiraleggplant August 30, 2020