drain the main vein

A slang rhyming reference to the idea that a urethra is similar to a vein or artery.

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drain the main vein (third-person singular simple present drains the main vein, present participle draining the main vein, simple past and past participle drained the main vein)

1. (vulgar slang, of men) To urinate.
   • 2003, David Zielinski, A Genuine Monster, page 232:

     I got to drain the main vein, kiddo, so you just stay put.

• See Thesaurus:urinate