To the definitions given I add that 'hampa' in graphoscopy and graphology is the part of a handwritten letter that protrudes vertically upwards. It comes from the French hampe ("spear pole" ).
It means marginal group acting against the law. Group of people who come together to commit crimes. Crime, chuzma, mob, morralla. Set of hamburgers or criminals.
Hampa : Escapo , bohordo , herbaceous stem.
HAMPA:DELINCUENCIA.GROUP OF PEOPLE THAT LIVE ON THE FRINGES OF THE LAW.SET OF GANGSTERS OR THUGS.