It can mean a couple of things - either you somehow hurt yourself and become unconscious (for example, you run into something and hit your head) or it's a sarcastic way of saying "go ahead and try your best, I think it's hopeless."
Being knocked out comes from someone being hit hard enough in the face in a boxing ring that they are unconscious.
The phrase "knocked up" is slang for pregnant.
knocked out
To become pregnant
It means to get pregnant.
it means they insulted you in some way
it means you have no sence. Not awake or knocked outt
you are exited
A rule requiring that a boxer who is knocked down three times in the same round be declared knocked out
KO Means knocked out
getting your girlfriend preagnant before marraige
A dash ( - ) in bowling is a symbol indicating that no pins were knocked down.
If you say dark me or you out. It means punch me or you so hard I get knocked.