The song doesn't end with "whooo-ahha hey la la" - it ends with "La ilaha illa Allah," which is much more representative of the nature of the song and Everlast. He had just come out of recovering from a heart attack, and had converted to Islam - hence "La ilaha illa Allah," the first part of the Kalima Shahadah, Islam's declaration of belief in the oneness of God. The Shahadah's daily recitation is one of the five pillars of Islam. Clearly, this is a very spiritual song for Everlast, and it shows in the lyrics.
The song doesn't end with "whooo-ahha hey la la" - it ends with "La ilaha illa Allah," which is much more representative of the nature of the song and Everlast. He had just come out of recovering from a heart attack, and had converted to Islam - hence "La ilaha illa Allah," the first part of the Kalima Shahadah, Islam's declaration of belief in the oneness of God. The Shahadah's daily recitation is one of the five pillars of Islam. Clearly, this is a very spiritual song for Everlast, and it shows in the lyrics.