馬うま並なみ

na-adjective, noun

hung like a horse; big-dicked

Vulgar slang describing a man with a very large penis. Often used in casual, crude, or joking contexts.

• あいつは馬うま並なみらしいよ。

  I hear that guy is hung like a horse.

• 馬うま並なみって言いわれたことある？

  Have you ever been told you're big-dicked?