(interjection) An expression of irritation or anger that exploits the ironic juxtaposition of the scatalogical expletive "shit" with the harmless fluffy imagery of kittens. Also alludes to the colloquialism that one is so nervous/upset that one could birth kittens, or shit something unusual.
Shititties is a compound word you would use in the place of another curse word. It is considered a curse word and I do not suggest you say it at high school. You can and will get ISS for 5 days because you said two curse words in the span of one word. This word was founded by: I don't know Aqua Man.