1. [1980s] (US black) to steal, esp. in the street.
2. [1990s+] (US drugs) to suffering withdrawal from narcotics.
3. [1990s+] (US prison) to need intensely; to be addicted to.
4. [1990s+] (US black) to act aggressively.
1. to show off, to outdo a rival.
2. to covet, to lust after, to become obsessed with.