Something to say to someone you havent seen in a while.....probably for good reason....this saying is a good way to make the person think you want to hang out with them with out really committing to plans
"Hey Henrietta, I havent seen you in forever!"
*snort* "Yeah, want to see my insect collection?" *snort*
"Yeah, I cant today but we should do something sometime"
This phrase is similar to "already know (something)" or "have known (something) for a long time". It's used when one is too lazy to speak the proper phrase. "Been knowed" seems to have a more powerful meaning though. Like you've known something so long that it's ridiculous that the other person trying to inform you of the topic that it is utterly ridiculous.