A sexual maneuver involving going "down under" and sucking the filth/exrement out of someone's butthole while manuvering the penis manually back and forth, the way one moves a vaccuum cleaner over a carpet.
I can't believe Jamese suggested that she give me an Australian vacuum, and then tried to kiss me afterwards! Oi, oi, oi!
When banging a girl doggystyle you grab her by the wrists and pull both arms back towards you. Thus causing her to nosedive into the bed/couch/floor. The moaning and heavy breathing causes a vacuum effect upon any surface her face comes in contact with. This move is not for the faint of heart but one that can yield spectacular results. In other words, it's a game changer.