Go pound sand is an American idiom used to rudely and forcefully tell someone to go away, get lost, or stop bothering you. It implies that the person's presence or request is unwanted, dismissed, and that they should engage in a pointless, futile activity. It is a slightly cleaner, yet still aggressive, alternative to "fu***ck off".
The phrase dates back to the 19th century and is believed to have originated from the idea of performing a useless, mindless task. Some interpretations suggest it has roots in military jargon.
While it is not always vulgar, it is considered very rude, dismissive, and abrasive. Similar, more polite expressions include "go fly a kite" or "take a hike".
It is frequently used when one has no patience for another person's suggestions or presence, making it a definitive end to a conversation.
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As the middle east war dragging on,oil price surging, market tanking, Trump desperately wants to pull himself out of the mud, keeps sending negotiation request, intimidation, ultimatums; for he posted on Easter day early morning at 3:00 am, Tuesday will be power plant and bridge day...

However, Iranian side still doesn't seem to have any intention to negotiate anything, they basically tell Trump go pound sand. Now Trump set a new ultimum Tuesday 8:00pm, effectively postponed another 24hours of the attack which he previously threatened to bomb Iran back to stone age.