1.
If things are strung out somewhere, they are spread out in a line.
Buildings were strung out on the north side of the river.
ADJ : usu v-link ADJ , usu ADJ prep
2.
If someone is strung out on drugs, they are heavily affected by drugs. ( INFORMAL )
He was permanently strung out on heroin.
ADJ : v-link ADJ , usu ADJ on n