Top definition
The state of the Penis which is not quite a Semi, but definitely not completely flaccid.
'Third on' - Literately a third of the way through the erection stage.
'Third on' - Literately a third of the way through the erection stage.
"Dude, she's almost hot, I've kinda got a third on going on!"
"Wow that was an long drive, I've got a third on 'cause of the chaffage.
by funkymunkey101 March 15, 2009