Why is sucking snails dirty?

Sucking snails makes a squeak, similar to kissing.

This is a joke, because older snails taste like tongues in the process of sucking, and sucking snails requires some skills, so many people will be arrogant, but this is just a joke, which is harmless. But it happens every day, naturally.

It means that the tongue is very thin, long and strong, and snails can be sucked out only by the tongue. It means the tongue is very powerful.