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Brony term, meaning breasts in the crotch area of a pony from the My Little Pony franchise, used in MLP fanart. They appear to be attached/grown from the top of the inside back legs, or slightly forward on the lower abdomen. God knows who thought this was a good idea.
Do not look up "crotchboobs" unless you want to be traumatised.

Brony FanArtist: Hey, I decided my current drawings of characters from a TV show designed for little girls weren't sexualised enough, so I decided to add BOOBS in the CROTCH area, crotchboobs, gettit?

Brony: Hot. I'm not a pervert, honestly.
by Fen94 April 16, 2014