Top Definition
When heroine is injected into a vein in the penis while a man is orgasming. It is intended to exponentially increase pleasure.
I heard that the smacky jack feels like heaven. I want to try it but I don't have a girlfriend or any smack!
by Loube June 19, 2006

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To inject heroine into an erect penis just before orgasming. The effect is both explosive and calming. The combination of stimulant and downer exponentially increases the pleasure of each.
I wanted to try the smacky jack last night, but I was all out of smack!
by Loube July 29, 2006

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Smacky Jack is the act of shooting heroine into a vein in the penis just before orgasming. The combination has an overwhelmingly explosive then soothing effect.
Wow, I tried the smacky jack for the first time... and it was EXTREEEME!!!
by Loube June 26, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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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).

Buy the t-shirt