thick Osaka dialect (as supposedly spoken by Hanshin Tigers fans)
Slang, jocular term. Refers to the exaggerated, stereotypical Osaka-ben associated with passionate Hanshin Tigers supporters. Often used humorously or self-deprecatingly.
彼は関西出身じゃないのに、野球の話になると急に猛虎弁になる。
He's not from Kansai, but when the topic turns to baseball, he suddenly starts speaking in thick Tigers-fan Osaka dialect.
An internet coinage combining 猛虎, an epithet for the Hanshin Tigers, with 弁 “dialect.” It denotes the stylized pseudo-Kansai speech associated especially with baseball discussion on Japanese message boards.