It's a novel or one shot I don't remember I also don't remember if it's an original English wn or jp,cn or or translated. So in the story there is a noble girl who gets her fiance stolen and herself executed. She wakes up as herself from her childhood and tries living nicely but fails again by dying the cycles keep on repeating and in each cycle she tries moving forward in one she Yuri rapes her maid in the last section I remember she has gone to war capturing country after country and become an undefeated war goddess of sorts until God yeets the world again or something
It's a meme word, or in other words a new slang word. I've seen it used in several cases so I'll just list the different possible uses. "I want to yeet myself off a cliff" "Dude, why'd you yeet the cup?" (used after a man watched his brother knock a glass cup onto the floor, shattering it) "Guy's, is the past tense for yeet 'yeeted' or 'yote'? I don't want to make a fool of myself when giving my grandmothers eulogy" I've also seen people "yeet" an object when they throw it away, and in this case "yeet"ing the world would be reseting it. Overall there hasn't been a solid definition formed for it, but it's been used as a kind of general purpose slang like I haven't seen since "f***". It's nice since I can use this one.
As far as I can tell, when you 'yeet' something, you're tossing it away/towards something, not really expecting it to actually reach your goal but just a hail mary sort of shot. In another context, if someone says/yells (people usually say it with some intensity) 'yeet' as they go off and do something, they're probably meaning something along the lines of, 'to hell with careful planning, i'm just going to do it and hope for the best'. Other uses such as in UnGrave's comment are also applicable.
eh, kinda similar but not really. Leeroy Jenkins is more 'let's do this sh**!' whereas yeet is more 'Whatever, i'm just gonna do this even though it's probably going to fail' or 'imma throw you the hell away from me'