I'm sure I'm about to offend more than one person, but I'll say it anyway. The following things are lame:
fartcans
ground effects on any car worth less than $25,000
lights under your car
truck balls
fake bullet hole stickers
stickers of corporations (Nike, DC, whatever the hell ROXY is)
lowered trucks (10x worse if it's a 4x4)
flashy rims on a crappy car
after market spoilers
having the name of your vehicle on a sticker on your windshield
"Dodge the father ram the daughter" sticker on your Dodge Ram
Calvin pissing on the opposing vehicle manufacturer sticker
God: Co-Pilot sticker
local radio station sticker
racing stripes on crappy cars (see attached pic I snapped in Fairview a couple weeks ago)
Acceptable things to put on your vehicle:
Jesus fish
Darwin fish with legs
your favorite sports team sticker (not covering your entire back window)
your country of origin sticker and/or license plate cover
certain bling such as chrome grille, chrome bug deflector, chrome door handles
front license plate with pretty much anything on it
nice rims on nice cars
IMHO, of course.