1. heroin. etym: intravenous users (junkies) refer to their addiction or injection vein as their "tapeworm."
3. insult. etym: derisive term for disdained person, whether junky, clingy, or obsessive.
3. compliment. etym: endearing term for a loyal friend. akin to the expression ,"you'll be the death of me."
"my tapeworm tells me what to do..." - System of a Down