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Acronym, meaning "god motherfucking dammit". Used to express anger but not offend anyone who may be easily offended.
Guy 1: I hate it when people compliment me.
Guy 2 walks over and says "Love your hair!"
Guy 1: GMFD, Guy 2
by thaeta July 02, 2010
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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