Kayoko Okubo(大久保佳代子) is a Japanese comedienne. She has formed a comedy duo,"Oasizu(オアシズ)", with Yasuko Mitsuura(光浦靖子) since 1992. Okubo and Mitsuura are friends from childhood.
Okubo's appearance on TV has become more frequent over the past several years, because her dirty talk has gained popularity among single women in their forties. Her boom was triggered by her appearance on "Mecha-Mecha Iketeru!(めちゃ²イケてるッ!)", a comedy show of Fuji TV.
Okubo couldn't appear on many TV shows for a long time, while her partner Mitsuura has appeared on many TV shows since 1990s. Because of this, working as a comedienne, she had also worked at a call center as a contract employee until August 2010.
Here is a video of Okubo speaking.
Kayoko Okubo on twitter