This word is derived from the alreadypublished;Lunchbox slang word. Lunchpale is a derogatory word that describes a specific person that you do not like.
A lunchpaler or lunchpailer is predominantly a male who licks his middle finger and rubs it around the rim of his own asshole. Then scoops any lingering debris back into his mouth to literally eat his own ass.
Man those guys are a bunch of lunchpalers!
Or...
I will look forward to my lunchpailers landing that trophy on my dresser by the end of the year.
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?"