1) Acronym for "Oscillation Project with Emulsion-Racking Apparatus" an experiment at the LGNS facility in Italy, an experiment known for promoting a sensational and clearly incorrect result that the neutrino can travel faster than light.
2) Verb: to screw up in an experimental or research context
3) Noun: an experimental error that should have been caught, but affected results.
4) to pull an OPERA. verb: to make an error when showing results; to engage in definition #3
Don't OPERA that cable!
Wait, this graph wrong, I pulled an OPERA.
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