The name “Soapbox” originated from the fact that these little human-powered machines were made from wooden soap crates and roller-skate wheels. 5. Three-time Formula 1 World Champion Sebastian Vettel participated in one of the races in a Mario Kart. ... The speed of a Soapbox vehicle can reach up to 112 km/h.

What does soap box mean slang?

Also soap box . an improvised platform, as one on a street, from which a speaker delivers an informal speech, an appeal, or political harangue. adjective. of, relating to, or characteristic of a speaker or speech from a soapbox.

What does I'm on my soapbox mean?

informal. to express your opinions about a particular subject forcefully: She never misses the chance to get on her soapbox about political reform.