(Sling; Catapult) Bringing a slingshot before a sick person in a dream means transporting him to a new place, or it could mean his death and burial.
A slingshot in a dream also means removal of a guardian from his office, or recovering from drug addiction, or it may represent a messenger. Using a slingshot to cast stones at others in a dream also means rightly invoking a strong curse on them.
If one sees a woman using a slingshot to throw stones at him in a dream, it means sorcery or witchcraft.
A slingshot in a dream also denotes just and harsh words. Holding a slingshot and preparing to shoot in a dream represents one’s strength and determination to say something just and true.
If one carries a slingshot but adoes not use it to cast stones in the dream, it means that he will repent for his sin.... Islamic Dream Interpretation
Vision + Depth Psychology: Using a slingshot: someone is planning a nasty- attack. Watching others use a slingshot: somebody is planning something treacherous, and your defenses are not what they should be.... Dreamers Dictionary
To see (or hold/use) a slingshot in your dream suggests a need to defend and protect yourself emotionally and/or physically. You are experiencing some conflict in your waking life. This dream may also represent a fear of sexuality.... My Dream Interpretation