Hmm...hmm....just playing along.....why not
"FDF" (Fellowship of Discus Fanatics)?
IMHO, FDF tells 3 messages:
1) Obviously you are into Discus - the fish btw (i guess the supporting fish picture on the shirt is suffice not to confuse layman with the other meaning of "discus")
2) You are a siao lot!
3) You share the same common intesest with us!
What say you siao kakis?