merp

What you say when you don't have an adequate response and are somewhat embarrassed or insecure about the subject matter.

Jack: So, how do your parents feel about us going out?
Annie: Merp.

Mom: How prepared are you to file your own taxes for the first time?
Jimmy: Merp.

Chris: What will it take for you to admit that you like me?
Lindsey: Merp!