I do not call that stuff the slather over carrot cake icing, that is vile gunk made from butter.

If you write icing then nobody is picturing that revolting stuff, they're picturing the fondant icing that you use on fruit cakes or the stuff make from icing sugar that you squeeze out of a bag to decorate.

I've never seen or eaten a cake (this is normal cake and not a cream cake)with sloppy icing on it