An alternative for "hi", "yo", or "whats up". Except, "yoski" radiates bold energy; it is only to be used in the most exhilarating occasions.
Yoski, whats going on
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When someone goes book, or book mode, they have messed up. They were unintelligent , made a petty mistake, or were oblivious to something obvious. Being book is nothing to be proud of, so now it has been made into a meme
Damn, I just tripped over my own shoelace; I've gone full book mode