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1.
Laugh with no sound.
You are in an extremely quiet office, you cannot Laugh out loud because this will disrupt the peaceful environment around you. LWNS will be a perfect word for you to use if you want to laugh with no sound.
person A : (insert something funny)
person B (IN A quiet office): LWNS
by mushroom12345 July 14, 2009
 
2.
LWN
Laugh With Noise - an alternative to the overused and antiquated "LOL" in internet chats room and instant messengers
person 1: was that an earthquake or did one of Uma's testicles descend
Person 2: "Dude! LWN i almost peed my pants"
by semester 4 June 27, 2006
 
3.
LWN
The act of mowing one's lawn while not in possession of pants.
"Wow, Billy just LWNed that lawn pretty good."

"Yeah, I took his pants this morning."
by Aeon Azuran September 05, 2004
 
4.
LWN
Laugh With Noise - an alternative to the overused and antiquated "LOL" in internet chat room and instant messengers
person 1: was that an earthquake or did one of Uma's testicles descend
Person 2: "Dude! LWN i almost peed my pants"
by rushabh shah June 26, 2006