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The lower patch on the back of a motorcycle club's vest, beneath the club's insignia, declaring what territory they claim.

The Hells Angels and Mongols have spilled a lot of blood over the right to wear a "California" bottom rocker, a privilege the Angels assert is theirs alone.
by pirate510 April 06, 2009
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2
The half-full cans of warm PBR found the day (or weeks) after a party. May or may not contain cigarette butts.
"It took me a half an hour to clean up the bottom rockers this morning"
by Sewdoughnum November 24, 2017
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