chestbum is the cleavage of the woman who has wide set breasts and heavy duty cast iron underwire, causing the appearance of an arse on her chest.
Check out her tits! They've sagged with age and she's hiking them up too high causing them to splay into chestbum.
by LeniMcPoopies October 31, 2009
When a bird has boobs that are so big, it looks like she has a bum on her chest.
Lad 1:' Fook me son look at the size of those bad boys'

lad 2; 'holy shit, they so big they loook like a bum'

Lad 1: 'thats classic chest bum material'
by WellsTownHero November 08, 2010

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