Stands out like dog's balls
Very obvious.
Person 1"Think anyone will notice the dent?"
Person 2"Mate, it stands out like dog's balls."
You'll also hear
Stands out like a shag on a rockalone and obvious; a shag is a cormorant
Stands out like a country dunnysimilar
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While you're here
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Extremely thirsty. Also used for weather that has not seen rain in months.
Completely full, usually after a big feed. Sometimes used for very drunk.
Showing off and very pleased with yourself.
Almost impossible to find.
Extremely happy.