Seen in last night's game...
The One Up - commonly used to signify the start of a one minute countdown until shooting and/or fighting begins.
The One Down - used after the one minute countdown, this is a last resort warning that Pierce will begin to attack.
The Saxophone - Paul Pierce is about to play some Kenny G ish on yo dome.
The Double Mash - though Pierce's face shows glee, this action signifies an impending assault with Pierce's two balled fists.