Rampant v. : Ramping; leaping; springing; rearing upon the hind legs; hence, raging; furious.

Rampant v. : Ascending; climbing; rank in growth; exuberant.

Rampant v. : Rising with fore paws in the air as if attacking; -- said of a beast of prey, especially a lion. The right fore leg and right hind leg should be raised higher than the left.

Example:
Rampant Sexism: One of the 12 Signs of Fascism: Which of the signs do you see and why is it important?

Taxonomy
Merriam-Webster Online Dictionary, pant, Dictionary, webster, forelegs, Word Games, Webster Online Dictionary with audio pronunciations, Middle English, hind foot, glossary, language, ESL, Search, nt, adjective, Etymology, Anglo-French, present participle.

Defination from the web:
rampant from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 2 a : marked by a menacing wildness, extravagance, or absence of restraint <rampant rumors> b : profusely widespread <rampant weeds> — ram·pant·ly adverb ...