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1.
(v) To rape something beautiful.
"Awwww man, she was so hot, but then she got muirheaded and now I can't look at her the same way."
by Carel December 16, 2007
 
2.
A Royal Scottish last name, very uncommon, and extremely awesome. These people are typically very smart, athletic and extremely good looking, in most part from their Royal blood line.
I wish I was born a Muirhead.
by Surname Dictionary December 17, 2007