Komodo, auto tag is basicly when u play tag at high speed with ur cars. You go and "tap" the bumper of another car making them "it". its incredibly dangerous at high speed if the person you tap cant control his car. I know a cop who played "tag" with other cops. the police version is: When ur working the graveyard shift and theres nothing going on, one car will take a cone and throw it out the window at another police cruiser (usually while parked). then the other cruiser will take the cone and try to throw it at another crusier and so on.
I was talking to a cop about that and he told me about one night when he was playing it. earlier in the day he responed to a B&E at a clothing store. Well the owner was throwing out a manakin and they asked if they could have it. So they took it and dressed it up in a cops uniform. So later they were playing "tag" and they had a crusier in hot pursuit trying to tag em, so they throw the dressed up manakin out the police van after going round a corner. When the other cruiser comes round they run over the manakin and they thought they ran over a cop. It was hilarious