Someone who helps a fellow human to successfully decline to participate in something, move ahead of another vehicle, put the moves on a romantic interest, etc.
One good way to provide passistance on a highway is to point out to the driver in front that the person behind him wants to get by, usually the reason that the impatient driver needs help is that the slowpoke in front is not aware that he is holding someone up.
by QuacksO November 02, 2021