A joke spawned from the mispronounciation of 'Choast' (cheese on toast). When people are making choast, and someone doesn't know what they mean, they usually ask for 'Shoast'. It is then customary for the other people involved to not explain the difference, while someone prepares shoast for the unlucky individual, then chases them with it.
Franky: whats shoast!? i want shoast!
Bill: u want shoast ey franky!?
Franky: yeah i want shoast!
Tony: ok dude im havin sum choast but il make u sum shoast man!
(skip to next dialogue as its explained above)
Franky: AHHHHH LEAVE ME ALONE!!!! AHHHH!!!!!