abbreviation
short for 'knackered', this word is used in England to describe something that is utterly pants or lame.

Short/Slang of 'Knackers' / 'Scumbags' used in Ireland to define sketchy characters, who'll steal you clothes, money, and other possessions you have on you when walking through the cities of Dublin or Limerick.
Wear tracksuits, travel in numbers, and cary knives.

Someone that is such a dope fiend they ask to scrape your pipe and lick you empty dope baggies they pick their face when nothing is there and leave puss juices all over your mirror.

The knack is a rare condition characterized by an extreme intuition of all things mechanical and electrical and utter social ineptitude.

it is the act of grinding the opposite sex .
for upmost pleasure and excitement.

Shortened version of "knackered". When you are so knackered you don't even have the strength to say "knackered" and can only go as far as "knacked".

Habbit or trouble for it.