deep tongue spelunking 

A severe type of cunnilingus (oral sex on a woman).

Deep tongue spelunking usually involves trying to get ones tongue as far into the vaginal cavity as possible.
This is usually done by tilting ones head back and almost inserting the lower jaw/chin.

Use with caution "DTS" has been known to cause severe neck injuries and may also lead to trout mouth if the receiver has not been properly identified.

"This girl was so hot I went deep tongue spelunking for WAY too long now I have to wear this neck-brace for a week."

deep tongue spelunking by Cracka61 December 1, 2006

deep tongue penetration 

A procedure performed by tongues of dimensions 5 inches or longer where the G-spot is stimulated until the point of orgasm

It can also be a term used for food.

"I just finished performing deep tongue penetration on my icecream and now my tongue is numb ," squealed Lucy.

deep tongue penetration by Lester the molester6969 April 8, 2018

tongue-deep 

putting the full length of ones tongue into any desired object or body region.

Jon: "i feel bad. last night i finally kissed Sarah."
Terryn: "whats wrong with that?"
Jon: " i went tongue-deep on her."
terryn: "oh man, i know how that feels. i went tongue-deep on some ice cream the other day."

tongue-deep by UFCAce November 18, 2012

deep throat tongue massage 

1. The act of licking ones balls while simultaneously performing fellatio 2. Deep throating a guy and licking his balls at the same time.

Sage was good, she never gagged while giving me a deep throat tongue massage. She would use her thumb to bring my balls closer to her mouth so she could give me my morning DTTM.

deep throat tongue massage by johnny rush February 22, 2008