What's the meaning of this sentence? "hint legs" and "roaring"?
Rampant means wild, out of control, to be up on your hind legs roaring at the world.

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Rampant is a word used in heraldry, the system of rules used to construct coats of arms.

When a lion appears on a flag or a shield, it can be in many different positions or 'attitudes' - lying down, walking, sleeping etc.

A lion rampant is standing up on its hind (back) legs with its mouth wide open to make a loud roar, and its paws raised to strike.

See https://en.m.wikipedia.org/wiki/Lion_(heraldry) for pictures and names of this and the other attitudes.

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I think it is hind leg not hint leg. hind leg means the back limb of an animal.

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Thank you very much, this sentence is for like a rampant lion or a rampant dog. That's interesting, I won't never forget it!!!

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"hind legs" means back legs.

For example: "a bear standing on its hind legs" means a bear standing on its two back legs.

"roaring" means for an animal to let out a loud shout or cry; the sound a lion makes when it shouts.

for example: "the lion roared"