Sbharris11

Since # also means pound, #Ezra should stand for Ezra Pound the poet. And I would rather have my Tweet, Though rose-leaves die of grieving, Than do high deeds in Hungary To pass all men's believing.

#sand means "pound sand." As in "go pound sand!" Just where the sand is to be pounded, is found by virtue of implied insult, and the history of this phrase. Probably where the sun does not shine. But in the 19th century this referred to people without the sense to pound sand into a rat hole.