Slippery When Wet...?

[JABBARA]

Hi Guys,


I usually come across with a phrase in the notams for Munich Int(EDDM) such as "Runways may be slippery when wet"

"Being slippery" is a natural conclusion after "becoming wet".

Or,
Does that phrase imply another meaning which I am unaware?

What dou you think it implies?


Thanks in advance