Bum Grubs 

Worms. Intestinal worms.

Look at that dirty little prick over there scratching his arse, he must have Bum Grubs (ass maggot or arse maggot). He laid a turd and it was crawling with Bum Grubs.

Bum Grubs by Jimmy B from Oz December 22, 2009

hows your bum for grubs 

how are you? or what's been happening? good ol' fashioned aussie slang.

as a "very" informal greeting "hows your bum for grubs?

hows your bum for grubs by the bobs January 17, 2014

Bum Grub 

An individual who likes to play with other men’s anal cavities.

“Did you see that guy jam his finger in that dude’s arse? He was 3 knuckles deep!”

“Yeah, that’s just Josh being a bum grub again.”

Bum Grub by Clank clank I’m a tank August 14, 2024