A mentally retarded person with a small head that makes a soudn like this...

Reeeeeeeeeeeeeee
Reeeeeeeeeeeeeeeeeeeeeeeee

The meep is an interdimentional being that is undefinable by any human measurement. However it manifests itself as a head with a huge smile and special ears. It also wears a spotted party hat. The earth, and everything, was created by the meep. After he was finished, he smiled from ear to ear and put on a wonderful party hat. The meep simultaneousely watches over everything and everyone on the earth and throughout the many universes under his jurisdiction. The meep has a strict moral code, wich can be summed up by three letters arranged as points on a triangle surrounding his beutiful head. These letters are H, D, and S. The Meep stands for happiness, drugs, and sick beats.

The sound that the roadrunner makes

Meep meep, (also known as meepus meepus) is the representation of the shout 2-3 friends use in a cult-like chant while operating a small vehicle

Sound you make when someone says something t-totally fucking stupid; as to imitate the sound of a retard bus.

the sound made while grabbing a nice pair of female breasts.

To make a variety of uncomfortable and whiny cat like noises