Glo-Stick is simply a spelling mistake for GLOW STICKS.
A glow stick is a plastic tube that once bent and 'snapped' glows in a florecent colour. Often associated with nu-rave and clubbing.
YOU: comin to the Rave saturday?
ME: yup got my glo-sticks ready and all
YOU: dude! u got glow-sticks!?? Man , I wish !
ME: g2g ! cyu then!