bum jack 

the exercise of anal sex with one partners arsehole masturbating the others penis.

After we sucked each other off i gave the stud a bum jack he would never forget

bum jack by p.m.n August 12, 2003

Bum Jack 

The act of stealing something through burglary or mugging. Perpetrated by a homeless person.

Sam: Dude my backpack is gone; I left it in the park and now it's not there.

Matt: I bet you got bum jacked, there are hundreds of 'em in that park.

or

Matt: Jesus christ!!

Sam: What?

Matt:I just lost my wallet to a bum!

Sam: Dude you just got bum jacked!!

Bum Jack by mvellone October 23, 2008

bum jacket 

The build up of gas in ones underwear from constant flatulence, covering the bum region, and often providing warmth and comfort.

I have a thick bum jacket after the curry last night.

bum jacket by Nellenick January 16, 2011

Bumjacking 

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.

Bumjacking by GolfGTI5 May 18, 2019

bumjack 

to have anal sex

Hey bigboy how about a bumjack?

bumjack by bruce February 8, 2004

bumjacking 

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!

bumjacking by omg! it's Lost September 21, 2005