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.
how are you? or what's been happening? good ol' fashioned aussie slang.
as a "very" informal greeting "hows your bum for grubs?
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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.”