Top Definition
When old friends or acquaintances don't recognize you because you've gained a significant amout of weight.
Mary: Thank goodness she didn't recognize you. That bitch is crazy.

Jim: I know, I'm fatcognito so she didn't know who I was.
by Butkis June 15, 2013

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.

×