Top Definition
an adult man who exhibits developmental retardation via an unhealthy obsession with trains
Did you see the railfag at the station taking pictures & getting excited about all of the trains rolling through?
by yonderway June 03, 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.

×