Top Definition
The universal math constant where every frequent female facebook, myspace, ect... user has at least one outstanding picture of their respective cleavage. Cases which include more than one include: the slut in your 3rd period gym class, the beach photos from spring break, and of course the ever loved low cut shirts.
Note: often along with said cleavage photo, an album with possibly more photos of similar exposure may be found that most likely contain side boob, under boob, and/or camel toe in addition.
Guy 1: Hey dude remember that girl I got with at the party last night?
Guy 2: Yeah man you're so lucky you got to see those jugs, I wish I was as fortunate as you.
Guy 1: Not so fast, buddy!
Guy 2: Gah, what?
Guy 1: She requested me on facebook. I think you should take a look at photo number 523.
Guy 2: OMG, it's almost like I was there with you.
Guy 1: Yes, man. Thank God for the cleavage rule.
*High Fives*
by shmonnorshmusie February 23, 2009
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