Quite handy tool for Microsoft Excel. Basically if you have that thing on, you can scroll around the spreadsheet without having to move the selection on a cell.
an amalgamation of 'scrotum' and 'bollocks' for use where neither term seems appropriate, e.g. in the presence of nuns (also can be shortened to 'scrollies')
'Pardon me Sister, I must just attend to my scrollies as they are somewhat constrained in the ladies underwear I am currently sporting.'