I don't know if it bad form to comment on someones sig or not, but...
I had to think about Sybir's "Drifting is the automotive equivalent of figure skating. Rallying is playing goalie without a face mask and grinning." and thought it didn't quite fit my mental image.
I would liken drifting more to bobsleding, and rally to luging naked while baseball pitchers throw snow/ice balls at you and grinning.