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The opposite of the word 'Tove' which means when something is over the top, the words are switched to make tover the op. 'Tund' is the opposite, meaning Under The Bottom.

It can also be used by Pointing your head down to the ground and saying "Thats a bit Tund!"
John Bullock "It's pissing it down outside" Tieran "That's a bit Tund"
by WBVids June 13, 2011