The KamehamehaWave is formed when cupped hands are drawn to the user's side and the ki is concentrated into a single point between the cupped hands (and the hands must be really close). The hands are then thrust forward to shoot out a streaming, powerful beam of energy. The blast can also be used, generally under extenuating circumstances, with just one arm or even the feet. In most variants, the user utters the word "Ka-me-ha-me-HA!!!" as he/she charges and releases the attack.
Drew using the Kamehameha
False Super Saiyan Drew using the Kamehameha (Drawn by SSJ mike/TheMelon93)