An onomatopoeic word indicating a quick licking action or sticking out the tongue (often used in spoken language and manga).
子どもがアイスを食べて、舌をベロリと出した。
The child ate the ice cream and stuck out their tongue with a lick.
猫が皿のミルクをベロリと舐めた。
The cat licked the milk in the bowl in one quick lap.
漫画では彼がベロリと舌を出すコマがよく使われる。
In comics, a panel of him sticking out his tongue with a 'berori' is often used.