Where is FFG?

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I noticed on the SNDB, the W/M $10s have been in Canada for quite some time (though many areas, particularly Atlantic Canada, has yet to see them).  We have seen such a tiny run of W/M $10s released so far, with FFF, FFH and FFJ being the only full-run prefixes issued so far.  Now we are seeing the R/M signature combo on the $10s, and to this date, the only remaining W/M $10 prefix, FFG, has not been issued.

I wonder if FFG may never see the light of day due to being interpreted as a controversial reference? AFG was issued in the 1980s, and BFG was previously issued twice, but I do not see anything controversial about them.

If FFG never will be issued, then this is a tell-tale sign that the $10 note has fallen further in demand, with only three full-run prefixes and two changeovers.  It will be interesting to find out how many of the latest batch of R/M $10s will be issued.

FFG is being skipped because of the several distasteful meanings behind the letters.  Check out Urban Dictionary.  Note, some of the material there is NSFW and/or not recommended for minors.

That's what I've been thinking all along.  With that said, I think the SNDB should be updated to label the row for FFG as "Not released".

I personally did not find anything offensive related to the letters. 
That said, I found the wrestling term quite humorous and don't see the need to skip this prefix.