half stock

Anytime the penis is only partly erect. Often used sarcastically when there is no abnormal blood flow down below.

"Did you just see how fast she ate that hot dog?"
"Yeah, she just gave me a half stock"

by Brock Stokley April 28, 2006

half stock

When you're half way down from an erection. Contrast to half mast being half way up to an erection.

I finished fucking her and now I'm half stock.

by VTI December 3, 2006

half a stock

A semi erection, where one simply goes chubby in the trouser department.

Fuck me, Kerry is hot. I swear she gave me half a stock!

by The-Shield March 1, 2004