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When a person can speak perfect English when they talk to you in person, but abbreviates every word in a sentence so the sentence becomes unreadable when they are online.
Spoken - Hello. How are you today? Did you pick up your essay from Mr Jones?

Online - hi how r u 2day did u pic ^ ur sa frm mr J

This is an example of a Mongathon.
Mongathon by Sundariel January 12, 2006

Megathon 

A challenging series of workouts led by Beachbody super trainer Megan Davies that consists of 2 live streaming workouts a day; spanning 3-4 days in a row.
These workouts occur once a month on the Beachbody on Demand Interactive workout platform and are designed to increase strength, improve cardio and endurance and burn fat.
Man, I still can’t walk up the stairs after doing the Megathon last week!
Megathon by EDGE-ucatedGuess June 6, 2022

bongathon 

A marathon bong session where everyone brings their own stash. The last person left conscious wins the bongathon, and as a prize, gets to drink the bong water.
I think I won last night's bongathon, but I don't really remember drinking the bong water.
bongathon by fugitive October 4, 2004

Mongatron 

Someone with five brain tumors and all the mental disorders
"Why are you talking like an absolute mongatron?"
Mongatron by JoeboiTheIdiot December 9, 2018

Manathon 

A woman dating man after man without a break in between.
That girl just dumped me for another guy, she is doing a manathon.
Manathon by -xRobyn Banks February 18, 2009

Mongatron 

Mongatron the ultimate stage of being a Mong.
Being so dumb and or retarded (either sober or intoxicated) that you lack all common sense to fully function as a human being.
Jesus fucking Christ, Alex is such a fucking Mongatron when hes drunk.
Mongatron by Faller__ July 7, 2020