making a Norbert

disappering for a long time without mentioning a word and then surfacing after a while, acting as if nothing ever happened

"Dude, where is Jane again?" "I don't know, but she is known for making a Norbert every once in a while!"

No'Bert

To be ghosting. Telling everybody everything but when time comes, being a no-show.

"Dude, have you seen Norbert?" "My guess is, he is ghosting again... Such a No'Bert!"