to pull a Cyril

You pull a Cyril when you are at a social activity, like work, school, party etc. and you take a tupperware out of your bag and start to eat.

Important: the meal can't be socially accepted. So it has to be something that a normal person wouldn't eat at this time.

He pulled a Cyril and ate some lasagne in first period.

He tried to pull a Cyril but his meal didn't get flamed...