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1. A day that is filled with so much cleavage and/or of such great quality, that the entire quality of the day is increased. Usually for guys only.

2. Day in which you see down the shirt of your crushes blouse for the first time and is so great that the quality of the day is increased. Again, usually for guys.
1. Joe: "Man, my day sucked!"

Steve: "Mine would have been shity, but I had a Cleavage-tastic Day! I saw down Jessica Alba's shirt!"

2. Joe: "Dude, I had a Cleavage-tastic Day!"

Steve: "Really!?! You saw down Cindi's shirt?"

Joe: "Yes I did Steve, Yes I did".
by Dr. Awesome-BatCow December 07, 2008
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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