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When two people are engaging in sexual intercourse
Jessica: So, are you sleeping together?
Angela: Yeah... But keep it quiet, I don't want everyone to know that I'm having sex with Jack
by thegirlintheflowertattoo July 26, 2012
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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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