A hard knock, a gangster or sumone who leads a hard life or has been through hard times.
its a hard knock lyfe biatch!
作者 kyle 2003年4月08日
Someone who lives a life full of hardships.

Also a song by Jay Z
I'm homeless, lost an eye, got shot, I'm addicted to drugs, and persistently tortured by God for all my sins. It's a hard knock life...
作者 joe tim 2011年3月01日
A term used in the military, for storming a house using violent force. It doesn't nessicerily mean shooting or throwing grenades before entering a room, but the soldiers will be highly alert and ready to do so.
The opposite is a "soft knock" which means knocking on the door and "asking" calmly to come in.
We did a hard knock on a house in Basra.
作者 puje 2009年10月05日
The product of a woman who has had her breasts enhanced via implants. When a woman gets an augmentation of her breasts they normally become hard while at the same time becoming very large. Large breast are often referred to as knockers so hence the name, Hard Knocks, short for Hard Knockers.

Hard Knocks is used simply because it is easier to say than Hard Knockers and woman have no idea what the fuck you mean when you say it.
"damn that girl has fake jacks for sure"
"ya, those are definitely hard knocks"
作者 SchlifeyHyphy 2009年4月10日
get hits / smashed / jacked
holy shit, my friend gave me hard knocks man.
作者 rrellz =) 2005年6月02日

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