Here in Bucks its a verb - Biffa means having a thoroughly good clear out. Used and
understood throughout
the village. Don't forget that it is a capital 'B' as it originates from the re-cycling company Biffa but applies to any skip, general tidy up or clear out including packing stuff up to take to the dump or
charity shop. Can Biffa out things like the car or your pockets. 'Biffared out' is also quite acceptable.