A friend who doesn't get high, but comes along so when you get high, they can watch your back and you don't do anything stupid. Also they can supply entertainment that makes sense, because they're not high. And they get the food when you get the munchies.
Pronunciation: \ˈhī ˈskül-ē\
Etymology: English (high school) + Nick (-y)
Date: 2010 ...
1: acting or portraying someone young in secondary school <childish>
2a: exhibiting less than an expected degree of maturity <immature>
2b: having room to grow into a conventional or post conventional moral reasoning <foolish>