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deadly laughter 

1: Laughing so hard, it could kill you.

2: Laughing so hard that it hurts.
3: Laughing so hard that you feel you are going to die, can't breath, etc. Ex: Hearing the best joke ever.

4: A sinister laugh that is full of evil. ex: A cackling witch
5: Laughter that is lifeless and does not sound happy.
"The witch gave the deadliest laughter when she cackled."
"Never tell a zombie a joke, it will give the most deadly laughter you have ever heard."
"After telling the joke, the room was full of deadly laughter."
"That emo stoner girl has the most deadly laughter when she hears a joke. It freaks me out."
"I nearly died from laughter when I heard the punch line."
deadly laughter by ldmtwo September 29, 2013
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alphabetical laughter 

When chatting on the internet you laugh so hard that rather than typing "lol" you randomly smash the keyboard and the result resembles something like hjdskfhkdfkdsj
(alphabetical laughter is commonly seen in a chatroom/private message setting)

guy 1: my dog just ate a box of crayons then left a rainbow in the neighbors yard...

guy 2: hdskjfhsdkfjhdsl

Knockback Laughter

A rare disease that only goes to the sweaty try-hards, trying to get a laugh and not a fake one. This disease will make you knock your head back and laugh up to the ceiling. This laugh is very easy to pick out of the crowd when you hear it. When you hear a har-har-har sound, you will feel bad for someone.
"HAR HAR HAR!"
Well someone has Knockback Laughter...
Knockback Laughter by jdm714 January 27, 2018

canned laughter

Any fake laugh track inserted into video in post-production in an attempt to liven things up or add the impression of a live, studio audience.
Person 1: "Did you see that new reality show they started airing? It's just... bad."
Person 2: "I agree. It's all just canned laughter and sex jokes."
canned laughter by carterUD November 19, 2021

maniacal laughter 

Heath Ledger’s Joker laughing from Cristopher Nolans “Dark Knight”
Joker: I’m a man of my word… *evil maniacal laughter*

love and laughter 

Best large pony, won at Harrisburg and Devon, and top placings at Pony Finals.
Everyone know Love and Laughter, that pony's won everywhere.
love and laughter by Ptpp February 21, 2017

fit of laughter 

a sudden occurrence of laughing very much
He broke into a fit of laughter. The joke sent the audience into fits of laughter.
fit of laughter by Maximus! April 7, 2017