1) originaly this was used as a nickname given to the bad members of the traveling community of the united Kingdom, and the Republic of Ireland.
2) but now it can be used to describe anyone who is a scumbag/rough, not just travellers
3) also means testicles
see also --- chav, sham, traveller, pikey, scumbag, council estate, football hooligan,
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{travelling community}
" these knackers walked into the bar last night, and started a fight when they couldnt get served "
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{scumbag/rough}
bob - " aw man, theres a bunch of knackers trying to get on the bus... "
billy - " crap... "
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{testicles}
"OW !!! godammit, you kicked me right in the knackers !!!"
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This word USED to mean an Irish traveler and typical scum from Ireland, nowadays it is used as a term to refer to people with a thick dublin accent, wears Burberry, Adidas, Nike, Reebok and other typical sports clothing.
It has become VERY common with youths and the thing is is that older adults still feel it means the same as what it used to. Well, it doesn't.
This word has become as popular as the english term chav, which would probably be a better choice to search for what a knacker means.
A person that is a bit of a bellend but can also be used in friend groups to call each other knackers when they do someonestupid or something that annoys them.Can also be changed to knackered,knackers or knackse