Ok, so now I've learned that there are two sets of lyrics to that lovely tune.

I'm posting this link, and possibly ducking for cover, but I've been to a workshop run by James Hill and he is brilliant. He explains the feet-tapping rhythm on this video as well. St Anne's Reel starts at 3 mins 28 and his explanation on the Nova Scotian feet-tapping starts at 4 mins.

James Hill, Smash The Window / St. Anne's Reel