Go Pound Sand American informal slang
The idiom go pound sand is an expression of contempt. English speakers may use it to tell another person to go away, get lost.
This idiom is just popular in some parts in America. Native English speakers in other parts of the world are unfamiliar with it and do not use it.
Go away
Why don't you go pound sand instead of keeping distract me!
That's so rude of you to keep asking me about my salary. Why don't you go pound sand!
A: You should teach your child how to use a spoon while eating instead of feeding her, she's 6 years old now. B: I don't see that's the problem. A: You're spoiling your daughter rotten! B: It's none of your business, go pound sand!
People should be careful about the context when using this idiom, because 'go pound sand' is only used when you show contempt to someone or sonething.
Before the 20th century, 'pound sand" means do something pointless. Until the 20th century, the phrase changed into an expression of contempt and was only just becoming popular around this time.