Similar to a golden shower, but you're not getting pissed on. It's when you drink/swallow squirt from your partner as a way to satisfy yourself, them, or both of you.
Bro 1- "Well look at her, damn she's pretty."
Bro 2- "Be careful with her, she'll leave your face wet, man."
Bro 1- "Like, glass shower territory?"
Bro 2- "Drowning.."
Bro 1- "Fu-uck, man."