What is the meaning of Euh?

er, erm, um, uh; used as a space filler or pause during conversation

er, erm, um, uh; used to express hesitation, confusion, or doubt

er, erm, um, uh; used to express embarrassment or subtle disagreement

an onomatopoeia of the filler sound

er, um, uh; expressing hesitation, reflection, confusion, or doubt

Source: wiktionary.org