Ad-libs 

Generally redundant improvised or unrehearsed lines that are frequently used in rap music.

examples of Ad-libs:
Lil Jon: Whaat? Okay! Yeaah!
Young Jeezy: Daaayum! Ayyyy! Thaaat's Riight!

Ad-libs by NoCows4Rob February 12, 2006

ad-libs 

Hack writing at its purest form.

With Ad-Libs, idiots can now make their own stupid book just by filling in the blanks.

ad-libs by hi, my name is Name September 8, 2007

Ad Libs 

While in the process of a song, the panning of your voice adding emphasis to phrases to empower your lyrics. Additional punchlines & etc.

"Dont ask me i'm just thinking out loud,(aaaaaaayyyyy!!!)
Purple haze got my head in the clouds." - Young Jeezy

Young Jeezy more/less popularized ad libs.

Ad Libs by Tha Menikian Man September 3, 2008