a sarcastic exhalation through the teeth, immediately followed by an abbreviation of the word "yeah". Sarcastic response to a question which requires a yes or no answer. Often used by teenagers, potheads, "valleys" and surfers. Another way of sarcastically saying, "Ya think?!", "hello!" or "No doubt!"
As there is a word that's Ceeb which means "can't be fucked" but as an acronym. The word Sheebsh is an emphasis on the word ceebs in a sentence to make things crystal clear about how lazy you are. Usually, when saying this in a conversation, you have to say it, almost like your spitting with your teeth.
Onni: Bro, send me the link to that website my man, I can't find it.
Andrew: ceebs, just find it
Onni: Bro you serious? Just send the link bro, It ain't that hard
Andrew: SHEEBSH