This is a term used to describe an inept electronics technician who, instead of just seeking out a cold solder joint in an IC (integrated circuit board) or replacing a 10 cent capacitor or equivalent small faulty component they will just order the whole part and make you pay for it, without doing a standard current continuity test.
Chances are you've been taken by a board monkey.
This is one of the great hidden secrets of "repair ripoff". More people in this world have been burned by board monkeys anywhere, in any industry where electronics is remotely related, than any other scam in repair.
The panel of buttons between the two front seats in a 1989 Pontiac Bonneville has an integrated circuit board that apparently costs "750 dollars" Canadian. My daughter spilled a soft drink down between the buttons, rendering it unusable.
Upon telling them that a continuity test is in order with a bit of cleanup, instead of just a board replacement, the bill miraculously became 75 dollars and the panel was fixed and functional. I basically told them everything I said here to get these results.