malapropos \mal-ap-ruh-POH\, adjective:
1. Unseasonable; unsuitable; inappropriate.
1. In an inappropriate or inopportune manner; unseasonably.
As an on-air radio pronouncer, I am quite familiar with the hazard of opening the mouth before the brain is in gear. It is very easy to fire-off a malapropos statement in the heat of trying to make a point and the result is some funny things are said, but perhaps not meant.
-- Gerry Forbes, "Foot-in-Mouth Afflictions", Calgary Sun, March 18, 2001