undertongue 

Historically known as "the vagina of the mouth," this area has gained recent popularity among "headventurers" for remaining constantly wet and sensitive.

Headventurer:"Sheila, lets try something new"

Sheila: "oh ya, put it in my undertongue"

undertongue by Gorilla Adam December 6, 2009

Undertongue 

1. (n): Area on the bottom of the tongue where the tongue attaches to the rest of the mouth. (You know what i'm talking about- it's all veiny and full of saliva)

Girl: "I was picking my teeth with a toothpick and I slipped and stabbed my undertongue today!"

Guy: "Wow. You impaled your undertongue? Gross."

Undertongue by K Floss December 6, 2009

Sexual undertone 

Brought on by either visual or verbal stimulus a sexual undertone is a gesture that can be taken as casual but also sexual or can be something that you say that could be applicable to sex but isn't openly talked about as so.

Biting lip, flipping hair, rubbing ones elbows,fiddling with your ears, deep eye gazing,scratching around corner of the jaw,scratches nipple? Or sayings that apply to moments that are intimently significant that may seem innocent but have sexual implications# sexual undertones

Sexual undertone by Chechemakasla March 6, 2018

Sexual undertone 

Implied either visually or verbally the sexual undertone is an unspoken sexual tension brought on by the use of words that would cause arousal for both parties without completely obvious sexual connotation

Wow that parking spot is very "tight" I font ever think I'll be able to fit in there#sexual undertone

Sexual undertone by Chechemakasla March 6, 2018

undertonguer

The title given to a person with a severe lack of tongue action during kissing . We’re talking less than sub 20% tongue to kiss ratio. Refer to overtonguer.

She’s a total undertonguer ... she needs to get more movement happening, it’s like kissing a mannequin

undertonguer by Chippawood April 13, 2019

Under Tongue 

The fatty tongue under your real tongue. If you have a "fatty mouth" you most likely have an Under Tongue.
Mouths with under tongue are usually better when giving oral.

My girl has an Under Tongue so you know that head is on point.

Under Tongue by StefVonE December 1, 2022