To be covered in semen or to be extremely tired.
"dude that guy knackered me last night"
"i thought you were a guy!"

"oh. oops. i guess im gay."
by aboybrushedblue May 23, 2010
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Road-man term to describe something as being annoying
by Johnny S. April 10, 2021
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injure oneself in the testicles, usually through a hard blow or landing
that football player just knackerated himself on the goal post
by Foeff April 3, 2010
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the knacker man, as in "fit for the knackers" i.e. exhausted, dead
eeh by gum, ah wuz fit for knackers
by dilbert scrunchie June 20, 2003
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having suffered an injury to the testicles

used almost always in the case where injury results from a fall from a beam with both legs going opposite sides of said beam
"I knackered myself when i fell off the monkey bars"
by Phillip J Brown January 22, 2007
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Your balls
That really twists my knackers, bro
by Spectra_ January 18, 2017
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