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1.
A mixture of annoying and try-hardy-ness but not at an extreme level.

Word founded by Jo Luu as of '06
Ehhhh he's a really nice guy in real life but on the net he's a bit tatchy....
by jo luu September 30, 2006
 
2.
The feeling you get from wearing a wooly sweater that your nan made that makes you itch like crazy and your skin crawl.
Man I cant wait for christmas to end this sweater my nan gave me is soo tatchy
by Shingademous June 10, 2010