and to complete the triad [...]

Or is it a quad set, completed with tish-tosh? [ga-goo @ 542]

http://www.trussel.com/flipflop.htm

(This site has a few other points of interest too)

This is sometimes identified as a UKnism:

…Emma Thompson as Amelia, the half-feline captain of the ship, whose Britishisms like "Oh, tish-tosh!" adds some dry wit to the stellar swashbuckling.

http://atlanta.creativeloafing.com/2002-12-04/flicks_product.html

Elsewhere it’s suggested as of Scottish origin…

TISH-TOSH (Scots equivalent of "stuff and nonsense")

http:// www.hradec.org/projd.html