noun
Gunma prefecture (jocular/derogatory)
A humorous, often derogatory nickname for Gunma Prefecture, created as a pun on ミャンマー (Myanmar). Used mainly in internet slang and casual conversation.
ネットでは群馬県のことをよくグンマーって呼ぶよね。
On the internet, people often call Gunma Prefecture 'Gunma' (as a joke).