a state of comfortable intoxication from alcohol (usually beer) and possibly marijuana; the beautiful place between "tipsy" and "drunk" or "crossed" at which an individual feels his absolute best during his or her evening.
after another rip off the joint, one might say he or she is "stack-a fuckin-lackin"
Dudeski 1: "Woah. How you doin man?"
Dudeski 2: "Man, I'm stack-a-lackin."