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1.
A non-existant word that mentally challenged people often confuse with the word "rampant."

See below.
Jack: The disease ran rampid throughout the country.
Jill: Rampid is not a word, you moron.

Jack: Pirated music is rampid in the Internet.
Jill: Are you really that stupid?
by iamchris January 26, 2009
 
2.
the act of something growing very fast; or spreading through an area quickly

The disease ran rampid throughout the country.

Pirated music is rampid in the internet
by Dylan (tyg) April 20, 2008