FedEx’s call of “on the go” is clear to me. It means he’s executing a go-around. It’s common terminology, perhaps a carryover from the US Military
Well it is not clear to me as a European Controller and Pilot. This US terminology is prone to be misunderstood outside the US and Fedex does fly a lot outside the US.
Now listening to the 2nd tape between tthe Virgin and SW it looks like not only the Virgin but also the Air transport was not familiar with the local uncontrolled ramp practices , 2 a/c of of 4 on the frequency in a 3 min R/T sequence would indicate there is a problem that needs to be looked at I would say .