The moment in a evening when a group of friends/acquintances reach a communal state of intoxication through whatever means drink/drugs. At this point no one talks sense and everybody turns into a piffleing mess. Often seen/heard are half finished sentences, looks of complete amazement at the piff coming out of peoples mouths and the obligutory quote "sorry what was i talking about.....".
This piffleing ramble can go on for upwards of 4-5 hours which is the way this definition is heading.
"can you remember poony talking piffle last night? ..... ive never heard such random poppycock about the outragous price of strawberry bon bons"