No, it is not used in AmE, and most Americans wouldn't know what you meant by "git." Back in the late 1960s, when the Monkees were touring England, Micky Dolenz heard the expression "Randy Scouse Git" on a television show, and he used it as the
title for one of his songs. In the US, it was released with that name, which no one really understood. In the UK, however, the song was going to be banned by the BBC unless Dolenz came up with an alternate title. So, in typical Monkees fashion, the tune was called "Alternate Title" in the UK.