Jeeez, gooseman, this ain't exactly helpful, is it
? What with more lingo and everything...
B_K, "drive-by" is used to denote a particularly unpleasant style of trade execution. Normally, a "nice" trader would do his whole trade with a single cpty and then sit back, in order to allow the said counterparty to unwind the risk in the mkt. So, for instance, say you need to sell 2bn EURUSD. You do the whole clip with a single dealer and pay the bid/offer commensurate with the large size of the trade. Then you stay out of the mkt to allow the dealer to do their magic and sell the 2bn EURUSD that you just saddled them with. That's a nice gentlemanly way of doing things.
On the other hand, if you were not a nice guy, you could simultaneously hit 20 bids from different dealers in 100MM clips. You will be able to do what you're trying to do and will probably save yourself some bid/offer. However, the dealers will be very upset, since they would now have to go into the mkt simultaneously to try to sell their 100MM chunks. That's a "drive-by" and it's done either if a) you're mean; b) you're trying to make a point; or c) you're desperate.