A fork of Rural Dictionary
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.
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 the act of ones nipples contracting and getting "hard"
Maggie was embarassed because all her class mates could see her T.H.O through her shirt.
Abbreviation for titty hard on. Pronounced like though.
Gadzooks take a look at Amy! Totally has T.H.O. going on.