When you become drunk and high at the same time.
Bro wana come over and get riverstoned?

sweet ill bring the weed you bring the beer.

awesome!
by PMOSLICE November 19, 2009
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A slapper from the suburb of Riverstone in the Hawkesbury region in New South Wales, Australia. Can also be a cougar or a scantilly clad woman.
The pub was full of Riverstone Slappers on Saturday night.

Person 1: "Dude do you want to go to the Mean Fiddler?"
Person 2: "Na man its full of Riverstone slappers'
by windzaa September 12, 2012
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