When you snap your fingers to the beat of a song, and you do it while doodling or eating snickerdoodles.
Dude, why are you being such a snapperdoodle tonight
Noun. Definition I: Refers to any particular object awesome enough to gain the prefix 'snap.' Also used to further annoy those who dislike the saying, "Oh snap."
Definition II: Expression used to acknowledge an outburst of rage or disbelief
Definition I: "Wow, look at them snapperdoodles!"
Definition II: "Oh, snapperdoodles, I failed the test!!!"