Top Definition
To walk behind a group of hot girls at the optimum distance and speed to check out their asses for a protracted period. As per the driving technique of slipstreaming, once one hops into a slitstream, you can ease your foot off the throttle and cruise under the draw of the slitstream.
I got caught in a heavy slitstream on my way to the train station and nearly ended up in the cinema.

I totally got busted slitstreaming a trio of gorgeous chicas last night.
by Arthur ASCii March 19, 2011
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