One who indulges in alcohol/marijuana/drugs and the like only on occasion-- especially during social events. Tasters do not have as much experience as non-tasters with a given substance, since "tasting" is usually associated with gratifying oneself on a low-intensity level.
(During a toast at a formal fraternity event)
Nate: "Here's a special
toast to all the tasters tonight! Let's live
la vida loca!"
(During a standard college party)
Mitch: "Man, these tasters are really pissin' me off! They're wasting all our
dank. Learn a little somethin' about courtesy and conservation before ya come strollin' through our
pad, expecting a
free pass, why don't ya?"