Slippy means a surface or object is hard to stand or hold onto because it is wet, icy, polished, or covered in something that makes you slide. If the bathroom floor is slippy, your foot goes out from under you. If a fish is slippy, it wriggles out of your hands. People also say the roads are slippy after rain or frost — that is the weather use, and it is very common. Though actually, many teachers will mark slippy as “not the real word” and tell you to write slippery. Both are real. Slippy is the shorter, more spoken form. You hear it a lot in Britain and Ireland, in homes and on the news when they talk about ice. Slippery is the form textbooks and American English prefer, and it sounds a little more careful. Some older speakers treat slippy as homely or even a bit childish, the way we say “the floor is all slippy.” It is not rude, and it is not a spelling mistake for slippery. It just sits on the informal side. You would probably not put it in a formal report; you would put it in a warning to a child, or in a message about the pavement.

滑的、滑溜的（口語，英式說法，意思同 slippery）