Jeremy Spenis's definitions
Similar to "half on" but with more expressed arousal. Can be caused by decreased lack of arousal from anxiety or from incomplete arousal (as in the case of a rodeo).
As I was frantically losing my hard-on, I saved it and maintained a two-thirdy. Whew! That was close.
by Jeremy Spenis June 22, 2010
Get the two-thirdymug.