The complete phrase is: 「日本中で、ばえていくけん！」.
With the けん at the end, I thought it might have been something from a Kyushu dialect, but the person who said this is from Tottori.
The only part I'm really having trouble with is the verb 「ばえていく」. I tried looking up ばえる and ばう as potential verb roots, but they don't seem to exist. Has anyone every heard of this?