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1.
When a male gets a boner and his shorts become tight, it appears as if he is wearing a pair of bicycle shorts.
When Jerry saw Linda walk by he was wearing bicycle shorts.
by Whereisgary? June 19, 2008
 
2.
Gay tight shorts worn by Cyclers to show off their bulge
Look at Joe's bicycle shorts.
by domonvoi August 16, 2005
 
3.
Shorts that professional cyclists wear, usually made from spandex and/or lycra.

Also one of the reasons why I don't enter trialithons.
Bicycle shorts look queer, why can't cyclists wear "normal clothing."
by Rhambi October 05, 2007