This is usually something someone who is really annoying will say. They are usually called Nigel. If someone says this to you then you should throw a manky stick at them.
Me: “ Your so ugly, you manky Stick
Nigel: “If you can’t say nothing nice, don’t say nothing at all”
by Elle-Woody January 31, 2020
Get the If you can’t say nothing nice, don’t say nothing at all mug.