Urban Dictionary: half on

1.	half on
	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. buy half on mugs & shirts hard on whisky dick chubby boner stiffy erection woody wood cock dick morning wood errection hard-on horny schlong willy hardon pecker semi wang balls chub dong flaccid johnson limp pitching a tent prick bone bonner erect flacid stiff hard meat purple headed yogurt slinger rod shlong by Harry T Aug 14, 2007 add a video