Top Definition
A scientific measurement of the strength of the smell of period blood (PB), present in the room. The range is 0-5

0- None present
1- Very small, usually undetected

2- Small, but detectable
3- Starting to stink up the room
4- May cause gagging, pretty damn strong
5- Induces vomiting and possible post traumatic stress.
Person 1- "SON OF A BITCH!! Do you smell that?"
Person 2- "Yeah man, there is a PB Rating of 3 up in here. Man, I still have nightmares of the 5 I encountered."
by esunc91 December 09, 2009

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