It`s the action of cutting off someone just a bit while walking. This makes it difficult for the person to decide to either slow down to let the person pass or move to the side and continue on. The moment the half-cut is initiated, the period of hesitance will start and will last about 7 seconds and, afterwards, the victim will realize the doucheness of this action and will be mad for the rest of his walk. The worst way to be half-cut is when you are walking along a wall and someone preforms a half-cut. In this situation, you try to pick up the pace and squeeze by, but ends in a awkward touching between the two.
Damn it! This guy just half-cut me!