The Urban Dictionary has three suggestions for the 'bouge' which has been shortened and affixed to the culturally acknowledged imagining of a punk... the most likely given Scout's proximity to New York as a student at Brown in Rhode Island is number three.
But equally, she and her friends could be referencing a smoking habit, imagined or otherwise.
1. Bouge
Fancy, upscale, expensive - relating to 'bourgeoisie.' Can be used as an adjective: 'You dressed so bouge today.' or as a verb 'You need to bouge up this party a bit.'
That outfit is so bouge. or That jacket is so bougie.
2. Verb
The act of smoking a cigarette.
3. Bouge
New York City, 2001
(1) (adj/adv/v) to be not good, pleasing or 'cool' or to be tainted or stained
(2) (n) -a common noun used for any place, thing or substance, or -a proper noun used as a semi-sarcastic term of endearment
(3) (n) a sticky, gooey substance
Most often used as 'bouge,' but there are almost endless variations in form (bouged, bougie, bougified, bouged out, bouginess, whatever) used to indicate subtle differences in meaning. May be used to refer to absolutely anyone or anything.
'Getting up early is so bouge.' (Getting up early is awful.)