Akanbe

Akanbe (あかんべえ), also spelt Akkanbee (あっかんべー, アッカンベー), is a Japanese facial gesture. It consists of someone pulling down their lower eyelid to expose the red underside towards someone. It is considered an immature taunting gesture. It is often accompanied by the person sticking their tongue out. The gesture is used often in manga and anime by tsundere characters.

Akanbe in other cultures
The gesture means different things in several areas of the world outside of Japan. In Italy, it means take care, in France, it means that you cannot believe something and in the Philippines it represents crying. In Spain, it is a notice to people that a good looking person is nearby. this gesture is some times used by Iranians, especially people from Qazvin province. the difference is that it's not used just by children. in iran this gesture is performed together with the word "hooshdili" meant to tease someone who has failed to do some thing.