Somebody who keeps the middle of the street, the way an aircraft pilot would taxi the runways.
I could not avoid a collision. The road was narrow, and he kept riding his motorbike on the center line like a aircraft pilot keeping the nose wheel on the guiding line.
An acronym, when fully "un-acronized" it means: production in lieu of testing. Usually where a group of developers decide that their deadline is far too close to employ normal testing measures, they opt to release the product in its current form, and then fix "broken" functionality when user's bring it to their attention by complaining about it.
Bob said "hey, I don't think we are going to have enough time to test this release..." to which Dan replied "well, then it looks like we will have to run a PILOT program..."