The overwhelming feeling of euphoria experienced when spending time with or in the presence of a Brian. It has been known to cause swooning, increased heart rate, weakening of the knees and is rumored to cure the common cold. Though extensive research has been conducted in an attempt to bottle it for commercial reasons, it is currently only available through direct personal contact with a Brian.
"I've been really depressed and lonely lately, I don't know what I'm going to do?"
"You should go hang out with your friend in Georgia... sounds like your suffering from a Britamin P deficiency!"