The waste toner cartridge container, is otherwise known as a waste toner bottle.
This page explains the basics about it:http://www.tcnj.edu/~helpdesk/documents/Canon%20eManuals/Canon%20Color%20eManual/iRADV_C5051_Manual_us/contents/mtc_008/func.html
It contains stuff of the tonery kind swept out of your printer's workings, toner that isn't re-usable, and has to go somewhere. It fills up slowly so you have a day or two, probably, or a bit more - that depends heavily upon whether you print a lot, with a lot of graphics etc, or just a few text pages per day at the other extreme.
The manual info Canon offers on this message about waste toner full, is 'contact your service representative'.
If you need instructions for how to perform the waste toner bottle removal / replacement / disposal, you would most probably find specific instructions, with diagrams, in the service manual for this model of Canon machine:http://www.servicemanuals.net/ServiceManual/CANON/IR2200/452843/detail.aspx
As for obtaining a replacement waste toner bottle - if the procedure is not simply to remove it, empty the waste toner out, and put it back in the machine - this website offers it and shows what it looks like, also:http://www.precisionroller.com/waste-toner-containers-for-canon-imagerunner-3300/details_31297.html?src=gbps
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