RSA

RSA – Rear Seat Accessory – A member of the opposite gender, usually decorative in nature, that occupies the passenger’s portion of a motorcycle seat.

I’m looking for a new R.S.A.
or
My biker friend lost his RSA the other day when it fell off; I'm helping him find a new one.

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Rear Seat Accessory

A fine ass girl on the back of a dude's motorcycle.

Example: I'm looking for a new rear seat accessory after my last one fell off.

Synchromoneous

The convergence of desirable sounds in a grouped atmosphere.

Example #1: As another Harley fell into the pack, their heavy synchromoneous sound filled the air.

Example #2: The synchromonelus sound of the lovers moans and sighs enhanced the mood that evening.

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