Eep

Eep is a word that is commonly used after a sentence you have no response to. A response to 'eep' can easily be the word itself again. Eeps alternate meaning is an expression of speechlessness or surprise. Eep is also cartoon character from a cartoon called 'croods'.

"Why doesn't anyone respond to my messages?" --- "eep."
"Hey lil nas X.. I kinda broke your remote digital device.." --- "wHaT?! Why'd you do that?!" --- "eep."
"Omg i got accepted to Harvard!" -- "eeeeeeeep!"