G-String is the name of the black and light purple amphibious SUV limo that Scanty and Kneesocks use as their main form of transportation. It was first featured in "Les Diaboliques". G-String is an extremely fast vehicle, matching See Through's speed. G-String is also able to bend its form and advance on walls. Fastener is usually the one driving G-String and appears whenever the demon sisters whistle for him. The vehicle also has self-destructed button.
- G-String appears to be based on a stretched Mercedes-Benz G-Class SUV.
- The demon sister's bat-like logo on G-String's front seems to be a parody of Batman's logo.