A person with a Titty Hard On.
Dude check it out, that girls has T.H.O. ... it must be really cold outside.
Damn, she has major T.H.O., she's cutting glass!
Titty Hard On.
Coined by William Boland in 1989. Although most likely used before then.
That girl was either cold or she liked what she saw cause she had a major T.H.O.