Buttslam: Originating in ghetto of North South Yarra, created by the MHS White Thugs. A term used to describe all activies deemed buttslammin' by the White Thugs.
When something is underwhelming or disappointing. Most often used in a context that involves a person describing the poor state of something, such as a meal or TV show.
"Dude, this caf food is straight buttslap." "I'm bummedbro, that movie was buttslap."