derived from the word "busy". This is strictly a glasgow saying, particularily within the west end and medical school area. basy has evolved to have many meanings. it must be taken in the context with which it is said, see examples below.
basy is predominantly an insult. if someone were to say to you in sauchihall street glasgow.... " Aye you hink yer basy mate" it may mean... "yes my friend, you seem think your something special". or one may say... "aye how basy are you" and this would mean "haha check u ya tool" so it depends on what context it is used in. only experienced basy-ers can use it correctly, if it is used wrongly one may seem very silly to other basy users. basy may also be used to disrupt lectures and public events when silence is required. this is particularily prevalent in glasgow university medical school....where students have been known to have a tourets type outbirst of basy during lectures or medical balls. basy is not stricly a noun however, it can also be an adverb, as one can actually "be basied". this is where a basy-er sneaks up behind another person, and does a look of sheer disgust behind them while another mate takes a photo. this sort of immature behaviour brings shreeks of laughter to all other basyers as the person who has been basied is unaware of the situation. beware, cos basy belly and baldness shal get ya!!