it means "fat g wannabe" = fat people who just wanna be g's so they try to be cool and it doesn't work out for them.
look at that kid, he's an fgw. hahah
by Olethya February 25, 2010
First Great Western, a British train company that operates services in the west and south west of England and South Wales.
"The train now approaching is a FGW service"
by ItsOnlyCraig January 07, 2010