halfboob Share definition Flag As used in the CBS show "How I Met Your Mother". A short girl with an ample bosom resulting her to be half boob. That girl in the black over there is short, but has huge tits I love it! she is like halfboob. halfboob by Patty Mayonaise December 14, 2008 0 0 Get merch Get the halfboob mug. Buy Now — $32.95 See more merch