Australian rhyming slang used to describe a male getting so excited over something or someone that he gets an erection, or fat. A larrikin is a likeable rogue while an erect penis resembles a hat, hence the term larrikin's hat.
I couldn't help getting a larrikin's hat every time I looked at it.
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Aussie rhyming slang for fat, as in erection. A larrikin is a lovable hooligan; a hat is something worn on the head.
Trevor: Jeeze, I get a larrikin's hat just thinking about Britney pissing on me.
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