1. Occurring unchecked: Happening in an unrestrained manner, usually so as to be regarded as a menace
rampant inflation.

2. Botany growing wildly: Growing strongly and to a very large size, or spreading uncontrollably.

3. Fierce: Exhibiting ferocious behavior or fierceness of spirit.

4. Heraldry on hind legs: Describes a heraldic beast depicted rearing up, in profile, and with its forelegs raised, the right one above the left.

5. Construction with unequal supports: Having a support or an abutment that is higher on one side than the other.

when you're hungover as shit after a spending a night drunk as a skunk

When a female is dressed in sexy clothing she can make you feel horny

Cool / wicked / groovy / excellent / smart / fab / great / brilliant. Good, basically.

Extending unchecked; unrestrained