bike leg
n.β Β«Casati, like many other bike riding University of Montana students and faculty members, has gotten into the habit of rolling up a pant legβor twoβin order to keep it from catching in the bike chain. […] This fashion statement, known to some as βbike leg,β has made it easier to spot bikers on campus, sometimes even when theyβre not riding.Β» ββSave your pants, use a βgeek strap’ while biking” by Steve Miller in University of Montana, Missoula Montana Kaimin (Missoula, Montana) Mar. 26, 2009. (source: Double-Tongued Dictionary)