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.
Jim: Wow, I just finally did my homework for once in the entire year.
Chad: Jim, the level of shittitity in that statement you just made is at least a 67 on the scale.