The sound one human makes to another human when trying to get his or her attention. Sounds very nasally and alien yet a distinct noise of the Homosapien, a noise that raises a genetic response in humans causing ears to perk and heads to turn in the direction of the Nuephfert call origin.
Similiar to a goat call but for people. Dialects have been found in regions with clicks and "thock" sounds of the tounge and lip.
"NNNNuuuuueeeeppphhh-FFFEERRTTT!!!" cried a human to the other unsuspecting human. His head turns and awknowledges the presence of the calling Homosapien. (shit you see on nature shows but with people.)