bobber

Etymology
From the verb,.

Noun

 * 1) One who takes part in apple bobbing.
 * 2)  A buoyant device (frequently made of cork) attached to a line so as to suspend the end of the line with the hook (and bait or lure) above the bottom.
 * 3) A style of custom motorcycle with stripped-down bodywork and a shortened (or "bobbed") rear fender.
 * 4) A person who rides a bobsleigh; a bobsleigher.
 * 5) One who has a bob hairstyle.
 * 1) A person who rides a bobsleigh; a bobsleigher.
 * 2) One who has a bob hairstyle.