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1.
Slow moving, clumsy, stupid pedestrians. Not fit for sidewalks, bike paths, roads, etc.

(See Sped)
"Omg I can't get around this stupid spedestrian!"

"That Spedestrian forgot his helmet!"
by Hoofy February 11, 2009
 
2.
any person whose walk is the speed of an average man's run, yet still has natural steps. Scientists have yet to understand how they keep up speed for so long without running. May cause others in the group to jog in order to catch up. Made from speed + pedestrian
(pant, pant) Oh great, these fuckin spedestrians are killing me, I actually have to run to keep up with them. Damn.
by Paul Wall II February 23, 2007