Noun
go-fast (plural go-fasts)
(slang) A speedboat.
A go-fast boat is a small, fast boat designed with a long narrow platform and a planing hull to enable it to reach high speeds. Source: Internet
Illegal use A helicopter from the U.S. Coast Guard's Helicopter Interdiction Tactical Squadron pursues a go-fast boat during training These boats are difficult to detect by radar except on flat calm seas or at close range. Source: Internet
The U.S. Coast Guard go-fast boat is a rigid-hulled inflatable boat (RHIB) equipped with radar and powerful engines. Source: Internet