What was (one) smoking?

What was (one) smoking?

slang Used to express confusion, annoyance, or surprise at someone's past opinions, decisions, behavior, etc. The phrase alludes to the psychological impairment associated with drug use. What were you smoking when you picked out this hideous wallpaper? What were we smoking when we thought a flight at 6 AM was a good idea?
See also: what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See also: