An originally Dutch or Afrikaans (South African) word.
It used to be used only for food, as in tasty.
But now in slang it also means sexy or hot.
Often used to describe an attractive boy or girl.
It might also be used just as a replacement of cool or sweet. In this case, it is often followed by teh word man.
Probalably got adapted into the modern English language because of the South Africans. Who hae more interactions with the British and American that the Netherlands has.
As in tasty: That pizza was pretty damn lekker.
As in sexy/hot: Did you check ou that guy in the shoe store? He is so lekker.
As in cool/sweet: -Guess what? Iw on the first prize! - Lekker man!