n (countable) A juvenile delinquent, young petty criminal or trouble-maker.
n (uncountable) Any material used as tinder for lighting fires, such as agaric, dried wood, or touchwood.[http://machaut.uchicago.edu/?resource=Webster%27s&word=punk&use1913=on], especially wood altered by certain fungi.
n (countable) A utensil for lighting wicks or fuses (such as those of fireworks) resembling stick incense.