In the FUNimation dub, Vegeta and Bulma talk about the Blutz Wave, where a Sayian can transform into a giant ape by having a bright orb such as looking at the moon when they have their tail. But the word Blutz Wave is actually a translation spelling error from the Ocean Group dub. The correct term is 'Bruits Wave'.
In the FUNimation dub, Bulma says Vegeta could even go Super Saiyan 5, in the Japanese version Vegeta says "Kakarrot, bring on your Super Saiya-jin 4, or 5, or whatever you want! I'm still not finished!". But this form actually does not exist,