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1.
An expression of positive agreement, endorsement, or enthusiasm. Comes from the expression right on.
Person 1: We're going to see Team America tonight!
Person 2: Right arm!
by DC October 18, 2004
 
2.
A term used by preps to make fun of the term "Right On". Usually corisponded with "Farm Out"
"Right Arm, bong banger"
by Immortal-Jake May 10, 2006
 
3.
a lazier way of pronouncing "Right on"
"Did u get me the pack of schtigs that I asked for?"
"Yes, I did"
"Rightarm"
by JB January 30, 2004