Used to excuse oneself discreetly from a social situation without mentioning the toilet directly.

Politeness

Originally women's slang; now it's more gender-neutral but can still imply femininity.

Gendered Origin

It's a subtle way to address a bodily function without being explicit.

Refers to touching up makeup, especially to reduce shine on the nose.

Can imply getting ready or freshening up one's appearance, not just the nose.

Often means a quick touch-up, not a full makeup application.