Uh

THe phrase used to fill time while preparing your answer to what you just heard, also a word used to pretend you did not hear something in order for them to repeat giving you time to figure it out...

Tim: Oi, Steve, that looks like you in this picture with my sister naked?

Steve: Uh...

Tim: Who the fucks that in this picture of my sister man

Steve: Dont ask me man i didnt even know you had a sister, as if id wear a fag shirt like that anyways..

Tim: haha, yeah, guess your right