(Pha-Nom-al-Nan) It is the combination of the word phenomenal and phenomenon... Thus it means a phenomenal phenomenon. Also used to describe a unique food creation.
"Dude that vortex is a Phenomalnan"
or
"That chocolate refried bean sunday is a phenomalnan."
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"