A person who whistles show tunes all the time, talks really fast, tells painfully horrible jokes, and does other stuff that makes you want to punch them in the face.
friend: Omygizzzzzzzzzzzzzz! i looooooooooooove that kidddddddddddddd soooooooooooooooooo muchhhhhhhhhhhhhh
me: im sorry i can understand what your saying because i fall asleep before i get to the last "z" of omygiz.