To be "too smart by half" (also common is "too clever by half") is to be too smart for one's own good, meant either literally or ironically. As an idiom, it is usually sarcastic. The phrase has a wide range of potential uses; for instance, it can mean:
1.) Something so complex that it's self-obfuscating.
2.) A seemingly clever action that is in fact foolish.
3.) Logically accepting something as necessary that isn't.
4.) Overanalysis.
5.) Elitism (see ivory tower).
Caused by overworking the Central nervous system of the brain. Eventually certain parts of the body start to shut down, usually starting with the left foot and working its way up the body. Although T.S.D. is very rare, there have been 37 recorded deaths.
Stephen Hawkings is the most well known person who suffers from T.S.D. (Too smart Disease) Another well know case was Franklin Roosevelt
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.