I suppose you may never have noticed, but isn't it strange how
many meaningless but popular words for
good/trendy – like
groovy – are taken from the names of obscure
kinds of fish? There's hip, fab, hake, smart, dace, dab, rad
(herring), smelt, keen, ace, bream, neat, gear, char, plaice,
gnarly, guppy, funky, tunny… the list is endless!
Many of them of course are now hopelessly dated – nobody
chubser for at least a
century – but there are also a few that have survived by
becoming sex/drugs/rock'n'roll jargon; witness bass (guitar), roach
(cannabis cigarette), sole (music), skate
(-punk), cod (-piece), and jazz (formerly jads or shads).
You may imagine that groovy is a counterexample, but as a matter
of fact gnuibheadh is an old Gaelic word for
salmon – as in
Beinn Gnuibheadh (pronounced
ben groovy), a mountain near Loch Rannoch, which is widely
suspected of being the
Mons Graupius of Arthurian legend.
(And if you thought that was irritatingly dumb, try the -X Files…)