An ass-crack that gets exposed while BMX-ing vigorously.
Gravity and
fast peddling causing pants to
edge down creating a "Crandall"
"Man, you'd better stop peddling so
fast, you are getting a Crandall."
"
Dude! I can
see your Crandall from the ramp and it is gnarly!"
"Hey, pull your pants up! I don't want to look at your hairy Crandall!"