powder one's nose

verb2

1. •
   (euphemistic) To visit a lavatory to use a toilet, reapply makeup, (when used of a group of women) engage in private conversation, etc.

   • I'll be right back. I just have to powder my nose.
   • C'mon girls; let's go powder our noses.
2. •
   (slang) To snort cocaine or other types of drugs through one's nose.

   • The cokehead couldn't go more than a couple hours without powdering his nose.