Like the millisecond, the microsecond and the nanosecond, the ohnosecond is a measure of time. It's the length of time between clicking the mouse button, realising that you've done something disastrous, and exclaiming "OH NO!". We've all experienced an ohnosecond - hitting the wrong button and sending the joke email to the boss instead of your friends. There's nothing much you can do about it but it makes you very careful, the next time you send an email.
CARTOONS were originally preliminary sketches drawn on 'cartone', a strong type of paper