What does sand mean in slang?

In slang, sand has several meanings beyond the granular material found on beaches. One common slang meaning is to describe someone as having grit, toughness, or courage, as in he has a lot of sand, similar to having guts or being gritty. In older American slang, sand meant courage or nerve. In modern internet slang, to sandbag or to sand means to deliberately underperform to deceive opponents, often used in gaming, poker, and racing where someone pretends to be worse than they are to get an advantage. In beach culture, sand can refer to time at the beach or vacation, as in I need some sand. In construction slang, to sand means to smooth something aggressively or to cheat by adding filler. In some regional slang, sand is used to refer to money or sugar, though this is rare. In sports slang, particularly in golf, sand refers to the bunker, and to be in the sand means to be in trouble. In some drug slang, sand is a nickname for certain powdered substances, though this is uncommon and context dependent. In the phrase pound sand, it is an insult meaning go away. Overall, slang uses of sand often relate to toughness, deception, or beach lifestyle.