An astrological sign which causes tragic things to occur to the person. A Tragittarius' horoscope will tell them negative things every day.
Jim: Hey, do you want to go out to the movies today?
Bob: No, I cannot, for my horoscope tells me not to go outside today.
Jim: How about next week?
Bob: I am a Tragittarius. My horoscope always says that I will have a bad day.