This is a term first used by Nick from Nick's strength and power in late 2020. This refers to the lighting which is used by bodybuilders and gym goers when they take selfies and trying to show off their physics. This lighting along with the camera angle often make people look more muscular and shredded and it is not a real reflection of what their body looks in real life.
Okay so this could mean 1 of 2 things.... good night b as in babe or baby and goodnight b as in Bro... and if you looked this up you’re probably hoping for the 1st option. But don’t overthink it.. bc it’s just a fucking letter. Don’t be out here jumping to conclusions you bitchass
usually the girl that likes you or thinks you are cute will say goodnight with more than one t. She probably wants the dick as well so keep an eye out for more than one of those t’s