Sentence:  A <WSD>zonk</WSD> was way overdue, yet the boys knew that the Seniors knew they would think this was a <WSD>zonk</WSD> and would trick the boys by making this another real prize. 
Meaning of the word marked with <WSD> tags:  An unfavorable card or token, or undesirable or worthless item used as a prize in a contest or game show (such as "Let's Make a Deal").