Melp

A cry for help originating in the comic Dilbert after one of the employees is being loud and another threatens to pound his head into his torso. Commonly used by the socially awkward.

Melp! I need to find someone but can't because I don't know how to talk to people!

Mibble

a word generally used by your local awkward middle school girl friend group in any context , similar to Meep

Outgoing person: Hi! How are you!
Me: Mibble.