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Famed for being mentioned on the Late Late Show with Craig Ferguson, a Dutch Hat is when your partner wears a toy windmill on their head and you urinate on the windmill causing it to spin.

Traditionally the urinator would wear wooden shoes as to not step in his own urine.
"Jodie, your hair looks greasy today, didn't you shower?"

"Not since my boyfriend gave me the old Dutch Hat."
by Golliher July 23, 2012
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When European girls pile on a guy - usually American, but Canadian, Australia etc
"Time for a quick reverse Dutch hat then catching the train from Noddington junction to Bedfordshire. " source: Craig F tweet.
by bruxisme July 17, 2012
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