I think this song is about being full of life and feeling good about yourself and the opposite sex. One could change the focus from "girls hit your hallelujah" to "boys hit your hallelujah" because the meaning of the word HALLELUJAH! is a shout of joy, praise, or gratitude. Therefore in this song seeing the opposite sex makes the singer express praise to the "One Who Shall Prove" that we were created male and female and each one is beautiful in the eyes of the other. It is a celebration of joy and well being. It is a celebration of joyful life energy (see www.freeonlinedictionary.com which I used for my reference). Letting the music "funk you up" means letting the rhythm of the music lift your heart in joy and well being. "Say my name you know who I am" I am a one who is beautiful and happy. Showing up and "jumping on it" dancing to the beat. Jumping to the beat. "Get on it". Move and celebrate life. "Uptown funk you up." Going uptown to get hear the rhythm and dance with the joy of being alive and free on a Saturday night. Smooth and sweet and full of the heat of being alive.