If something is tangy, it has a sharp, strong taste that is almost sour.
Tangy is usually a good taste, like in fruit or some kinds of candy.
Examples:
The orange juice is tangy.
The tangy apple made my mouth water.
She likes the tangy taste of the lemon.
The tangy candy made my face squish up!
The tangy sauce was so strong, it made my eyes water.
The tangy flavor was like a party in my mouth.