"strapped on"=strap used to tie the arm
"please let me get my hands on it"=the drug
"as ugly as the last one and twice as far from unwound"=the junkie's tolerance for drugs builds up and he needs twice as much of it to get the same high
"pushing past the red"=shooting up into an artery b/c all the veins are bad
This is about heroin addiction
"strapped on"=strap used to tie the arm "please let me get my hands on it"=the drug "as ugly as the last one and twice as far from unwound"=the junkie's tolerance for drugs builds up and he needs twice as much of it to get the same high "pushing past the red"=shooting up into an artery b/c all the veins are bad