Green’s Dictionary of Slang

1. (UK Black) sound used to indicate one’s approval.

2015		67 ‘Hookahs’ 🎵 Skrt Skrt in a three litre Volvo, rolling round with the mac on burst.
2017		hubpages.com ‘Roadman Slang 10 Jan. 🌐 Skrr - This amusing little word describes the sound that a car's wheels make when it swiftly drives away. ‘Skrr’ can be commented under pictures to indicate some sort of urban approval, like ‘rah’, but has a slightly different meaning in the sense that it is often said out loud too, and normally following the rule of three. e.g. ‘skrr skrr skrr, let's go clubbing tonight!’. Can also be used like ‘skrr, France is gonna be great!’.
2017		67 ‘Waps’ 🎵 Work, stay wealthy, skrr, jog and stay healthy.

2. as v., of an autombile to move fast.

2015		67 ‘Dead Up’ 🎵 Doing 110 in the whip it’s skurring, it’s German.
2018		Unknown T ‘Homerton B’ 🎵 Samurai’s in batches / Whack, whack, pull up, skrrt, reverse.