anything involved with partying which you usually pay for but have somehow recieved for free
as in free samples of alcohol
: "who am i to turn down such a treasure."
as in a pile of drugs
on a table at a party: "where is the guardian of this treasure, i must indulge."
as in finding a stash of drugs
, or other similar things: "what treasure!! how could i be so lucky."
as in buying a girl a drink: "here you go, beautiful, this treasure is for you."