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."
by UFCAce November 18, 2012
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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."
by Cracka61 December 1, 2006
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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.
by Lester the molester6969 March 29, 2018
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