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1.
A custodial technician who takes advantage of an accidental spill to fulfill mopping duties, regardless of other duties that may have been assigned to said technician.
High school kid: "Did you see that mopportunist hop to it when Jackie spilled her slushie before last period?"

High school kid's friend: "He dropped that plunger quicker than you can say 'Forget unclogging toilets!'"
by Teebs-Bizzle January 07, 2011