'Wanting-it' means when a man or woman takes a liking to the opposite gender and feels sexually attracted to them and wants to have sexual intercourse.

Giving up, not wanting to be bothered with it, a feeling of hopelessness.

gayin it up is basically not wanting to help or join others in time of need, not co-operating, or when someone is just being VERY difficult and/or selfish.
OR just acting in a homosexual manner.

n. When a technically inept computer user or geek-wannabe repeatedly hassles a legitimate IT (information technology) person in an attempt to befriend them and pick their brain for free computer knowledge. The person with the IT crush can't be bothered with reading books themselves, and also considers you be their personal IT person and will email you directly instead of opening a support case through proper channels. The IT crush may also go so far as insisting on being on your IM buddy list, and sends you 'helpful' email like computer advertisements and virus warnings, cartoons, etc..

Usually the most prone to latch on are also the most prone to be infected by a trojan or virus.

not wanting to partake in an activity,as in the gay lad in the first series of bad lads army who couldnt take anymore of the said corporals orders.

To get rid of a strong urge to do something; to do something that you have been wanting to do so that you aren't bothered by wanting to do it anymore.

The far-less-euphamistic version of "have your cake and eat it too;" An idiomatic figure of speech used to connote the idea of consuming a highly desired thing whilst managing to preserve it. This may also indicate having or wanting more than one can handle or deserve, or trying to have two incompatible things.