hallelujer is the ebonics version of hallelujah. the word is usually credited to madea (and often used by oprah winfrey) a character portrayed by black film maker tyler perry in his numerous plays and films.
Lucky for me - the po po didn't catch me speeding to wednesday bible study - hallelujer!
Hallelujah means to praise God. It is considered the highest praise by some Chistians, and litterally means "Let us praise God".
Hallelujah is also sometimes considered halleluyah, because thats how its pronounced, and because God's names are "Jahova" or short form "Jah", or "Yahwah", or a short form "Yah", which composes the ending of the word.