During the covid19 outbreaks in Australia between 2020-2022 Politicians often drove their own agendas by implementing a law or rule and justifying it by saying "Based on Health Advice". This started with the best of intentions but ended up a little self serving and crazy, particularly in places like Western Australia where they full on took the piss and you could pretty much say "Based on Health Advice you're going to jail"!
The public caught onto this and it became common to use this as a sarcastic tag line when making an excuse for getting what you wanted or making someone else suffer. This was called a BHA or "Based on Health Advice"
"BHA (Based on Health Advice) you're shouting dinner".

I said to my girlfriend "BHA you're on top tonight"
"Sorry dude BHA you're not invited."
"BHA , i'm riding shotgun"
"BHA you're on dunny duty"
by ATM4 January 30, 2022
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a person who is clumsy and short, known for liking spongebob and memes.
Wow you’re such a loser bhas.
by youdontknowme55 October 30, 2021
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Sheena said she's about to BHA if she doesn't give her back her money.
by Big Purr 05 September 26, 2021
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During the covid epidemic in Australia politicians made many decisions "Based on Health Advice". At the start these were legitimate however over time they were politicised and used to further politicians agendas. Particularly in the Hermit Kingdom of Westralia where this was recognised amongst the doona dwellers and the term BHA quickly became a satirical phrase to excuse bad behaviour.
"BHA (Based on Health Advice) it's your shout".

"I told my missus, BHA (Based on Health Advice) you're on top tonight"
"BHA (Based on Health Advice) you're on dunny duty again"
"Sorry dude, BHA (Based on Health Advice) you're not invited"
by ATM4 February 1, 2022
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