cari istilah yang lo mau, kaya' sex:
 
1.
Like a hard on, it comes about when some thing is arousing, but not enough to induce a full erection.
While watching two average women make out, Jim noticed that he was sporting a half on.
dari Harry T Selasa, 14 Agustus 2007
 
2.
A semi-erect penis. (See: Semi, Chub) Fifty percent of a Hard-On. A "bulge in the pants," as it were.
I often get a half-on while leering at females on the subway.
dari Time4SumAksion Selasa, 06 September 2005
 
3.
When a mans dick gets bigger but not hard enough yet to not be bendable either with starting to get a boner or starting to go down.
Damn that guy has a huge dick

Nah he just has a half-on
dari Its_Fucking_T0m Selasa, 14 Juni 2011