"Stuff the Bears" is a song sung by Fanboy and Chum Chum in the Fanboy and Chum Chum episode "A Very Brrr-y Icemas". It's sung as Fanboy and Chum Chum work hard on improving the teddy bears so they are more radical, but they wind up destroying everything.
Fanboy: Stuff the bears with high explosives
Chum Chum: Then, replace their eyes with laser beams
Fanboy: Spitting acid and corrosives
Chum Chum: Just make sure their eyes shoot laser beams
Fanboy: Kung-fu grip and foo-foo blasters
Spinning blades, hydrogen
Chum Chum: Laser beams
Fanboy: Now, these bears are built for battle
Chum Chum: That's because their eyes...
Fanboy and Chum Chum: Shoot laser beams!