👉 The term "backwashed" is a slang term that refers to someone who has been intentionally or unintentionally exposed to harmful substances, such as drugs or toxins, and has subsequently experienced psychological or emotional distress due to the exposure. It can also refer to someone who has been exposed to toxic substances in a manner that causes them harm or injury. The term "backwashed" is often used in a humorous or ironic context to describe someone who has been exposed to something that they find offensive or