Urban Dictionary: T.H.O.

1.	T.H.O.
	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. buy t.h.o. mugs & shirts titty nipping out titty hard on tho tittie hard on by Libraryguy Jun 25, 2009 add a video
2.	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! buy t.h.o. mugs & shirts hard nipples visible nipples that poke through a shirt stimulated nipples nipples that are hard as a rock super hard nipples by Peanut Butter May 12, 2006 add a video