n. - Short for a "tits out girl." A girl who is aggressively putting her tits on display as through the use of a push-up bra, low cut top, or other devices. This may be involuntary for those with exceptionally large breasts, but is usually intentional.
v. - The act of dressing in a manner that most effectively displays a woman's breasts by pushing them up and/or out.
Can also be used as an adjective. See toggy