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

I couldn’t care less (but one must keep up appearances, right?)

Short for ad libitum. Means spontaneously, without prior practice or just unrestrained. Often refers to artists improvising, also known as "ad libbing", in other words playing from the top of their heads.

Adding additional layers of vocal inflections over the existing main vocals in order to enhance the vocal effect of the song and also to add more variation and excitement to the vocal performance. When done properly a song can go from a grade of a mere C to an A+...........

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

Vocal effects in music used and overdone by the likes of Lil' Jon and Young Jeezy.

Hack writing at its purest form.