A euphemism used by 90's Australian primary school children to refer to anal intercourse, usually with negative connotations.
Boy 1: oi where's Ricky? he's missed school for weeks.
Boy 2: nah yeah I heard he got a bumjacking by the principal for stealing deano's tuckshop money, apparently Rob from 6A saw him in a wheelchair on the weekend.
by GolfGTI5 May 18, 2019
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to go 'bumjacking' one must gather a bunch of males, and then proceed to cruise around looking for a sleeping bum. a kicker is elected. once a poor bum has been located, said group of males encircle him, the kicker kicks the bum and hollers, "wake up fucker", then the bum gets glazed.

yes, glazed.
eww, Kane told me all about 'bumjacking'...he said he loves to be the kicker!
by omg! it's Lost September 21, 2005
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