The process of using a magnifying glass and the light of the sun to ignite marijuana. Usually only done by geeks and dumb kids too young to buy lighters, it is a cheap, albeit slow, method to get high.
Stoner #1: Dammit, me lighter be broken. Let's go do us some solar hits.
Stoner #2: But we don't have a magnifying glass.
Stoner #1: Son of a. . . .