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A prawn is a guy or girl with a hot body but really ugly face.

A prawn smear is when you are so disgusted by their face that you take a shit and smear it all over their face during the act of love making, allowing you to do your business without having to look at them.
Last night, I met a prawn with the body of a greek god, and a face that no words can describe. While having sex, i was so appalled by his face that i had no choice but to prawn smear him.
by Mike the Cougar June 03, 2011