Slang for 'a Fitzgibbons'. Rumor has it that a drunkard couldn't pronounce the 'bb' part of the name correctly and the word was coined. Referring to someone as "a Fitzginnons" is meant to insult by assosiation with the original Fitzgibbons, who famously laughed at his students when they left an exam review because he wouldn't give them the answers.
John was a real fitzginnons for not doing the prized athlete's homework for him.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.