check out the plumbing

check out the plumbing

euphemism To urinate or defecate; to go the bathroom. I'll be right back—I just have to check out the plumbing.
See also: check, out, plumbing
Farlex Dictionary of Idioms.

check out the plumbing

Euph. to go to the bathroom. (The order is fixed.) I think I'd better check out the plumbing before we get on the highway.
See also: check, out, plumbing
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

check out the plumbing

and visit the plumbing
tv. to go to the bathroom. I think I’d better check out the plumbing before we go. Excuse me. I need to visit the plumbing.
See also: check, out, plumbing
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • plumbing
  • gravity check
  • rubber check
  • rubber cheque
  • check up on (someone or something)
  • check
  • check on
  • check on (someone or something)
  • check that
  • check up