Date: Fri, 7 May 93 21:30:47 PDT
From: phr@america.telebit.com (Paul Rubin)
To: rms@ai.mit.edu
Subject: FSF

Did you know that FSF in Germany stands for "Fisch sucht Fahrrad"?
Translation: fish seeks bicycle.  An FSF-party is a singles gathering, 
I think.

I'm not sure whether the expression is widely used.