Acronym for "Never Gonna Stop Me", inspired by the Rob Zombie song "Never Gonna Stop". Used when a person gets incredibly drunk and/or continues to drink a ridiculous amount of alcohol at once. Also used to define the moments when this will likely occur.
Boy, did you seeBrad yesterday? He really entered NGSM mode at the bars last night by the amount he was drinking.
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?"