Top Definition
slang. A fictional US Army Military Occupational Specialty(MOS) used to define a jack of all trades.
Wow, that guy must be a 99 ECHO! He does everything! He knows all the trades but he's mastered NONE of them!
by that other, ...other guy December 19, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×