When you don't have enough time, or don't care enough, to use a
hairdryer. Thus, you put all the windows down in your car and let the wind do all the work.
(Not to be confused with a hippie hairdryer, which involves the same concept, but includes the use of a bike instead. This version is "
greener",from which is derived its condition of being "hippie".)
Works best for guys.
Or girls with
short hair.
"Hey, Becky sure has some serious
bed head."
"
Nope.
Hobo hairdryer."
"Ah.I see."