A person who, instead of using a dick, uses their tongue. EVERYWHERE!!! Which kinda...sucks

To give oral sex to a woman, obviously sticking your tongue in and out of her vagina.

When a male, (or female) stick their tongue inside the female partner's vagina and licks it clean or until she reaches orgasm.

When your having such a good kiss it feels like your tongue Fucking.

when you and your partner put each others tongues so far down each others throats that you choke and possibly die of affixation...

tongue-fuck means for a guy to fuck a dude's butt-hole with his tongue as deeply as he can - trying to make the guy have a cumgasm - the dude may or may not be jacking off or sucking a dick.

The tingling sensation you may sometimes get in your mouth while having sex or masturbating.