drain the main vein
Proposed by a contributor, not yet supported by evidence.
Meaning · English
To urinate.
Register: slang, vulgar
Where it’s used:
Used
American English
Examples
I got to drain the main vein, kiddo, so you just stay put.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “drain the main vein” mean?
To urinate.
Is “drain the main vein” formal or informal?
drain the main vein is generally slang, vulgar.