when you are at a party and fat or undesirable females block your path through a doorway that you want to go through either on purpose, or unintentionally. when roadblocked the victim is usually too disinterested or disgusted by the roadblocker(s) to ask them to move. sometimes roadblocking is used as a cockblock.
"i want to go play pong in the garage, but Bertha is roadblocking me"
by drunk cyclist May 15, 2015