an acronym for "we been knew". it basically means that something is common knowledge to you, it's something you've been aware of for awhile.
"you look stunning, wbk wbk" she replied to her friends latest post.
or
"is it true that daniel has been hostile to you recently?" she asked.
"ah, wbk wbk. it doesn't bother me though." he replied.
Wbkn is short for who be king naab. It is an expression to point out that the person who just made a stupid action is a very big naab (noob). This usually applies to people who do tai chi and listen to nebby larp music with a guitar in the background and have a lot of older sexy ladies they met at tai chi.