euphemism To go to the bathroom. The phrase is a polite expression used to excuse oneself when going to the bathroom. Typically used by women. I'll join you at the table in a minute, I just need to powder my nose.
powder one’s nose
1. and powder one’s facetv. to depart to the bathroom. (Usually said by women, or jocularly by men.) She just went out to powder her face.
2. tv. to use cocaine. John is in the bedroom powdering his nose. What a habit!