Is go pound sand offensive?

What’s the meaning of the phrase ‘Go pound sand’?

‘Go pound sand’ is an American expression of disdain, along the same lines as ‘get lost’, ‘go and play in the traffic’, etc.

Where does the expression go pound sand come from?

The expressions “go pound sand” and “not enough sense to pound sand” are American slang from the 19th century. It is a reference to menial, and often pointless, labor…. The latter phrase often appears in a longer form, “not enough sense to pound sand down a rathole.” This appears somewhat later.