Kek on the internet is waaay older than the_donald. There are two things I'd consider sources (although there's probably even older shit I've missed):
"Kek" is the equivalent to "lol" in korean
As far as the west is concerned, in World of Warcraft, if you were playing Alliance and a member of the Horde wrote "lol" in their language, you'd read it as "kek" (because your character wouldn't know their langage).
I am boomer. What is kek?
Turkish snack food. It's pepelicious.
Kek=lol Kek is also an Egyptian frog deity (it's very relevant) Exodus 8:1-15 Research the great meme war of 2016. You won't be disappointed.
It's something that was started back in the old the_donald days on reddit. It basically is our euphemism for LOL (laughing out loud)
Kek on the internet is waaay older than the_donald. There are two things I'd consider sources (although there's probably even older shit I've missed):
Actually it started long before that,. It started in MMORPGs.
How long do you have and how deep do you want to go?
Short answer, it means ‘LOL’.
Long answer, in the fertile crescent of the Nile River Delta, a burgeoning society of nomadic tribesmen was to be known as Egypt...
An Egyptian god of chaos.