What Does AMEX Mean? (Using AMEX Online)AMEX means "American Express".
Definition for AMEXAMEX means "American Express". This is the most common definition for AMEX on Snapchat, WhatsApp, Facebook, and Twitter. Here is some more information about AMEX:
1: Easy to guess
Using AMEX on a Cell Phone (SMS Texts, Whatsapp, and Yubl)