Jessica Beinecke, a 24 year old Ohio native who speaks fluent Mandarin, teaches Chinese speakers how to use American slang on her YouTube channel OMG Meiyu. Highlights include “Totes magotes!!” and “You’re such a PEACH!” OMG Meiyu is produced by Voice of America.
See this Washington Post article for more info on OMG Meiyu and Jessica Beinecke.
Thanks to Graeme Wagoner-Lynch for the tip!