colanderous. adj. To be full of sieves, like a colander. "Alzheimer's is generally associated with having a colanderous memory."
telligent. adj. stupid, the opposite of intelligent. "You're... you're... telligent!" shouted Rincewind at the troll. This gave him an extra fifteen seconds head start.
notwork. n. a non-functional network. "We can turn the entire internet into a notwork in thirty minutes!" boasted the hackers, who were promptly hacked to death with machetes by the unimpressed Polynesian tribesmen.
sacrificial guinea pig. n. A pilot study that also acts as an appeasement to any gods that might be watching e.g. Early Greek scientists used several youths as sacrificial guinea pigs in their minotaur studies.
jaydriver. n. A driver whose conception of traffic rules relies more on common sense than any old book rules.
Commercial Phone Worker. n. Telemarketer. Not to be confused with, but may be compared to, Commercial Sex Worker.
het adj. heterosexual. (Hey, it's easier to say than 'straight'!)
navella. n. A small navel. The term arose during a 12-th century argument between those who said that Jesus couldn't have had a navel if he was virgin born and those who said that the virgin business just referred to conception and not birth. Cardinal Bellybutton of Pisa proposed a compromise that Jesus had a navella. This was dubbed the Bellybutton Heresy.
The last should, of course, be taken out and shot. Anyway, a good site on this sort of thing is WordSpy. I especially like some of the words the webmaster has come up with, words that hopefully become scrabblable (usable in Scrabble) soon: copyrighteous, slackademic, awkword (a hard2say word), hasbian (dyke now in a het relationship), spontaneous program combustion (a program that crashes for no apparent reason after several hours), shiftless (someone who types in lower case only - OR ONLY IN UPPER CASE).