In modern times the porch sucker is some crazy ass fool who has neglected his/her duties as a friend, or stood you up to hook up with the opposite sex.
v. You can also say "this sucks a porch!". This implys a great distaste for some form of delinquency or inadequacy.
"God, my stupid porch sucking friends are so unreliable!"
"@#?!!@! PORCH SUCKER!!@@#@!?!"