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grin like a mule eating briars

A wonderfully vivid American Southern simile for someone wearing an enormous, unstoppable grin — the kind that spreads across the whole face and refuses to quit no matter the circumstances.

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#1·Apr 28, 2026

A wonderfully vivid American Southern simile for someone wearing an enormous, unstoppable grin — the kind that spreads across the whole face and refuses to quit no matter the circumstances. The image comes from the sight of a mule working its way through a thorny briar patch, lips pulled back wide to avoid the spines, which looks exactly like a huge goofy smile. It's affectionate, rustic, and almost impossible to say without smiling yourself.

When they told him he'd won, he just stood there grinning like a mule eating briars, not saying a single word.
Origin: American Southern folk simile; the visual image of a mule baring its teeth to navigate thorny briars gave rise to this expression for an exaggerated, wide, or foolish-looking grin. Editorial expansion authored on Slangora.
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#2·Apr 27, 2026

(US, simile, colloquial) To grin very widely.

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