The acronym for "driving while
Mexican", a
joke phrase commonly used to satirize the profiling stereotype/reputation of law enforcement in rich caucasian (and right wing) cities and suburbs.
Also see: DWB (driving while
black)
My buddy Lupe was driving through north Clovis, California in his lowered 80's Monte Carlo with the giant Raiders
sticker on the back when he was pulled over for DWM and they searched his
car and found his
pipe and bag of weed.