An underwater blow job. To have oral sex under water as in sucking cock or licking pussy. Maybe While your partner complains about feeling nothing or gags from the slime on ones vagina. Which is common in this situation.
I bet out there right now theres someone whos haveing this read to them while they give their signifacant other oral sex and gagging.
That girl got so drunk last night we took turns giving each other snorkle fluffers, while i soaked in the hot tub.