Sentence:  I opt for a CN Burger combo – basically, a hefty cheeseburger and fries, with a drink. ... I collect, together with serviettes (you ought to need serviettes with a burger!), and one of their patented "<WSD>doofers</WSD>" – an ingenious cardboard contraption designed to stop your burger's innards falling out – and return to eat it at work. 
Meaning of the word marked with <WSD> tags:  An object the name of which the speaker or writer cannot remember or does not know. (from 1930s)