1. slang An extreme, life-threatening physical reaction to some narcotic, especially heroin, opioids, cocaine, or amphetamines, often due to using an excessive amount; an overdose. My friend died from an overjolt of laced cocaine. I don't touch the stuff ever since. I just stick to smoking weed—no risk of an overjolt on that stuff.
2. slang To experience such a reaction. My brother actually overjolted on morphine after getting addicted to it following his surgery. I thought you were overjolting from the way you were sweating and your eyes were rolled back in your head.
1. n. an overdose of drugs, especially of heroin. (The abbreviation is an initialism. Drugs.) Ted is suffering from a serious OJ.
2. in. to take an overdose of drugs, especially of heroin. (Drugs.) She overjolted once too often.