To dream of poison ivy represents feelings about situations being so dangerous that you don’t risk getting close to them at all.
To dream of getting poison ivy on your skin represents embarrassment or surprise that something normal you did in waking life has ended up having such unbearably frustrating consequences. Feeling stupid that you didn’t consider how dangerous something you were doing was. Feeling angry with yourself for not being more careful about a big problem you feel stuck with.
Alternatively, poison ivy in a dream may reflect issues with intense itching.
Example: A woman dreamed of having poison ivy all over her body. In waking life she had contracted chicken pox. While the itching symbolism is obvious, the poison ivy symbolism may also reflect the woman feeling stupid for having not thought being near the the chicken pox infected person wasn’t dangerous.