Top Definition
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 13, 2006

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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."
by Beil February 13, 2005

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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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 02, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt