End Of Universe.
Used to end a conversation, if someone is annoying you and you want them to stop talking to you, or your dissing someone and you want your diss to be the last diss.
person1: i own
person2: at nothing
person1: aka everything, eou!
person2: damn! i guess you really do own
person1: hey i ended the unvierse, you cant say anything!
stands for end of universe, you can also say 'eoe' for end of everything, or eoi for end of infinity, they are all used when you want your insult to be the final insult, so you end the universe/everything/infinity knowing that you won the arguament even though you had to end the universe to do it.
frank: damn i pzzwn
reuben: oooooh man your teh fatness
tom: wtb (what the beast) you guys suck, i prwan
frank: you guys are both teh newbz full stop, eou
damn they got prawnt!