An immensely powerful blue beam of energy used as a last resort in battle because of its potentially planet destroying power.
Featured users of this attack in all the Dragonball series' are, Goku (Kakarot), Gohan, Goten, Krillin, Yamcha, Master Roshi, Majin Buu and Cell.(American version names)
Derivitives of this attack are, "Final Kamehameha" when Goku and Vegeta fused (Final Flash and Kamehameha).
"Big Bang Kamehameha" used when Vegeta fused with Goku.
10-fold Kamehameha, Goku in the super saiyan 4 level uses this in DBGT.
"Foot kamehameha" Goku used this to fly into the air in DB
"Kamekameha" Goten mispronounced the actual name and the attack was unmastered.
"kamehamea wave is incorrect"