Words at Play : Top 10 Favorite British Words, Vol. 2
Definition:
touchy; belligerent
Example:
"So when I resist meditating for a week or so, boy do I become stroppy and out of sorts." comment on HuffingtonPost.com, December 12, 2009
About the Word:
Stroppy may be a shortened, altered version of obstreperous (which means "difficult to control and often noisy").