Deep sea snorkel 

Deep sea snorkelling is similar to the original snorkel. However, when the giver of the snorkel licks the guys balls and wanks his cock, s/he takes a deep breath and goes down further. Often including rimming of the receiver's anus. Thus looking like a deep sea snorkeller.

Suzy's boyfriend had an especially fantastic orgasm when she began to snorkel him and then surprised him by taking it further and indulging him in a session of deep sea snorkelling.

Deep sea snorkel by Suzydafluzy August 30, 2006

Deep Sea Snorkeling 

When a man or woman goes down on/eats out a female.

Rick is a Deep Sea Snorkeler.

Rick was Deep Sea Snorkeling Michelle for hours on the washing machine.

Deep Sea Snorkel sessions can be reduced to "Snorkel" in conversation, such as:

Michelle loves being snorkeled.

Deep Sea Snorkeling by Brooklyn Snorkeling Society January 2, 2011

Deep Sea Snorkling 

when a man is sleeping and another man puts his balls on his eyes and rubs his dick down his chin so that it looks like the sleeping man is wearing goggles and a snorkel. then dick smack him vertically and yell BUDWEISER!

Dan went Deep Sea Snorkling last night and almost drowned.

Deep Sea Snorkling by ADDDvice July 10, 2010