an exclaimation said when you suddenly out of the blue see a large amount of cleavage. derived from saying holy cow or holy shit when you see something that shocks or surprises you.
girl 1: hey wanna see a picture of me in my prom dress?
girl 2: sure *gets pic* holy cleavage!
girl 1: yeah sorry about that...but do you like the color?
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an exclamation used when someone is showing entirely to much cleavage.
girl with a low cut shirt walks up
"HOLY CLEAVAGE BATMAN!"
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