My friend is intelligent sometimes

Trashy
A person who lacks class. Trashy people exist among all races and socioeconomic levels. Trashy people lack meaningful goals and purpose in life. They are not very concerned with academic subjects, worldly matters, nor culture, but are more amused with unimportant matters and simple activities such as celebrity gossip, shopping for useless merchandise (like cigarettes), and excessive partying into late hours. Other than spending money, trashy people contribute little or nothing to society, which is why they are associated with "trash". Due to low self-esteem and insecurity, trashy people inhale a lot of filth from cigarettes, attempt to overcompensate and "try too hard". Examples are wearing excessive amounts of make-up, wearing provocative clothing (whether they're in shape or not), driving a vehicle that is excessively large for their needs (e.g. a Hummer), getting drunk and behaving obnoxiously in clubs and bars, yelling at strangers from car windows, making derogatory statements, promiscuity, and talking loudly in profane and explicit language in public. Although they may think they're cool, most other people find them obnoxious, stinky, immature, irresponsible, and unattractive.