Can be used as both noun and verb and in both singular and plural form.

Definition:
A series of names, words, or other items written, printed, or imagined one after the other: a shopping list; a guest list; a list campaigns.

Use:
When the form of the word list would work but you just want to sound like a moron.

Demographic:
Usually findings of this word are heard from sub-educated lower class African Americans and smelly Anglo-Saxon hippies or crack heads.

Origin:
This word finds its birthplace at the forefront of stupidity in the telemarketing industry when the originator asked the question "Uh, Uh...Uh..When are the list-a-siz gonna be fixed?".