English readily absorbs both the best and worst of all the other languages. If some other language has a word that really hits the mood of even just a small amount of English speakers - bam! - it's English now, motherfucker!

Add to this, it's chock-full of complicated and often hidden rules that can - or absolutely cannot - be broken, depending on context. No wonder people learning it as a second language have that permanently confused look on their face.