When having taken part in the collaborative, recreational consumption of foreign substances; in this case Marijuana. One will become undoubtedly "Henge". This is due to the fact that the only collection of stones quite big enough to truly symbolise the true extent of how fucked you and your chums are; is Stone Henge.
Hence the term: "Henge"
"I was gonna go to school, but then I got Henge"
"Shall we get Henge?"
"I'm like totally Henge right now!"