halfstock 

semi-erect or semi-flacid. However you want to look at it... I choose semi-erect, as that seems more positive.

"Man, I'd fuck that shit out of that bitch, but I'm halfstock."

halfstock by Beil February 13, 2005

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"

half stock by Brock Stokley April 28, 2006

Halfstack 

Derived from the address "555 1/2 W Holland St.", along with a half stack amplifier metaphorically speaking, the Halfstack is the most amazing bachelor pad in the southeast region of South Dakota. Business offices below the apartment share the address "555 W Holland St.," thus the partial "1/2" comes into play. Apartment tenants go by the names "Josh" and "Kyler."

Dude, we gotta go to the Halfstack for a good jam session!

In verb form:
Joe is Halfstacking it up with his buddies.

Halfstack by Joshua Harrison Ford October 18, 2010

halfsterkur 

"Half-strength" in Icelandic. Often confused with "weakling" or "useless."

Rafe attempted to lift a halfsterkur stone until his undercarriage dropped out.

halfsterkur by Ronald Sampson August 23, 2019

Halfstache 

1) Half of a moustache and/or beard. Preferably the left half is kept and the right half is shaved.

Dude, the halfstache is the most innovative thing of our time. It looks sweet!

Halfstache by Ian B. Line March 27, 2007

halfcocked 

having a dick that is half the normal size. Having a dick that is half the size of your wife/girlfriends lover's dick (Primarily in the case of a cuckold). Inadequate penis

My halfcocked husband watches me take a real dick before cleaning up the mess

halfcocked by halfcocked January 21, 2007

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.

half stock by VTI December 3, 2006