Har Har tharsdays 

The program on Cartoon Network that lists new episodes. The announcer dude on Cartoon Network would say "new episodes on Har Har Tharsdays". That is what it is. Now for the way to use it: You must use it after a joke and it is silent. You may also use this if you said a joke and people dont think it was funny, then you just say it to make people actually laugh. This is funny because Har Har Tharsdays is on cartoon network and pulling something out of your crap makes it hilarious as hell. or you could just say it out of random.

Example 1:
Kelvin: LOL omfg district 9 was so crazy.
Panda: k...?
Kelvin: wow you're a fag.
Panda: Har Har Tharsdays

Example 2:

Hinson: har har tharsdays
Kelvin: dude why the hell do you say it out of random, thats so gay dude.
Panda: yeah man stop copying our words man seriously.
Hinson: har har tharsdays <----WTF?

Example 3:
Panda: so like i was walking down the street and i saw this big fat dude that was fatter than fat albert!!!
Some hot chick: mhm..? and whys that funny?
Panda: idk. HAR HAR THARSDAYS!
Some hot chick: LOL YOU'RE SO CUTE PANDA BOY <3

Har Har tharsdays by pandaboyxxx September 7, 2009

har har har

A very sarcastic form of laughter.

Hacker: lolz i just hacked dis noob.
Me: har har har... jackass

har har har by Bruteforce6 January 1, 2006

har har argh

Horny pirate talk, usually associated with lobsters and booties.

Argh the lobster is shivering me booty! That feels nice! Har har ARGH!

har har argh by Angry Crab December 28, 2005

har har har

Abstract form of laughing

That kid looks so funny, har har har

har har har by Jimmy N. September 21, 2003

Har Har Mahadev 

It means "Oh the supreme personality of godhead Lord Shiva please remove our sorrows"

Namah Parvati Pataye Har Har Mahadev

Har Har Mahadev by TabuuTKS June 29, 2022

Har Har Har

Another way to sarcastically laugh at something that isn't funny or a pun
Replacing the simple "Hahaha"

Person: You look like a traffic cone
Me: Har Har Har

Har Har Har by Mario's_Kingdom November 21, 2018

har har har har 

The same thing as Har har har, but if you thought it didn’t have enough ‘har’ in it.

Har har har har

har har har har by StarPrismGaming March 8, 2021