1. To smoke large quanitites of pot numerous times in a row. Generally applied when you are trying to stay high for the entire day.
2. To get stoned
"hey man whutch you doin today?" "yo nothin man just lampin out, my classes got cancled."
hey man spark that L and lets lamp out
get lamped out
and in its simplest form: "lamp out"
To turn off the lights and go to sleep.
Girl:What you want to do?
Other Girl:Im so tired ima lamp out.