Cum panties

Cum panties means that a male has ejaculated onto (see also: creamed) her panties. There are several reasons why he might have decorated her panty with his cum:

His ejaculation came before he could even penetrate her pussy or anus with his penis.
She gave him a handjob.
He has a panty fetish.
He targeted her mouth and shot her panties.

His cum will always leave cum stains on her panties, which will still be visible even after washing her panties. If he masturbated into her empty panty, it is called cum in panties.