What is "junk sick"

a. 1 (context slang English) Experiencing the nausea sometimes suffered by the user of a narcotic the following day, or after the effects of the drug begin to wear off. 2 (context slang English) Experiencing withdrawal symptoms when referring to the use of narcotics, often having flu-like symptoms. alt. 1 (context slang English) Experiencing the nausea sometimes suffered by the user of a narcotic the following day, or after the effects of the drug begin to wear off. 2 (context slang English) Experiencing withdrawal symptoms when referring to the use of narcotics, often having flu-like symptoms.