Refers to someone who doesn't have a good knowledge of English or any other language. It's like You always need a Rapid-Ex easy to learn Guide for that language inside the empty heads.Common examples:Chiragda,Indori... these are some other names by which rapidex can be identified.'Dude,you are a complete rapidex!!!', 'Tu toh saala complete rapid-ex hain'.... etc.
by Paul2lol October 02, 2011