"sat a gee"

Does anyone know the origin of this phrase? It was used by W.S.Gilbert in the Major General's song in Pirates of Penzance.

I believe it was simply a nonsense phrase that Gilbert made up for a far-fetched rhyme with "strategy."

I think both of the above are true. When performing this number, the Major General often pauses trying to think of something that rhymes with "strategy", and comes up with "sat a gee". I've also seen several productions where, later in a reprise of the song, he says "never rode a horse" instead of "never sat a gee".

Interesting site.