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Something obvious or something that everyone knows about.

It's called penis in the vagina because everyone knows about sex.
Guy to his friend: 8 times 9 is 72? Really?

Guy's friend: Wow. Penis in the vagina, dumbass.
by XoXo_ December 09, 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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