The word means as much as "Yes", or it can be used in any context without any meaning. Often used after a certain action has been done. Not really used in writing.

"* finished watching something * yeet"
"* goes to bed * yeet"
"* gets out of the shower * yeet"
"* takes a bite of his sandwich *.. YEET!"

It's often use to show excitement.
"This sandwhich is... yeet!"
"*Listen to sound of own fart*, yeet!"
"Sees someone accomplish something on tv.. Yeet"

Also used as a verb to throw something.
"Those batteries are empty, yeet them in the trash"
"I'm gonna yeet this bottle mate"
"Did you yeet the trash?"
"I yit it last night"

When you bite into a delicious sandwich and all the insides fall out of the other end. A.k.a. the Sandwich Rage.