Definition of "er"

If he—er—disappears—well, it seems to me that we'd both benefit.

2012, Linda Miller, Desire and Destiny

Liquid Samurai: 'FORMLESS AND INFINITE ARE WE, THE LIQUID SAMURAI. I SERVE MY QUEEN, AS WE HAVE FOR COUNTLESS--' / Mona: 'HEY, I DON'T MEAN TO INTERRUPT, BUT YOU SEEM LIKE YOU'RE MADE OF POWERFUL STUFF. CAN I, ER, STUDY YOU?'

2019 December 10, Yacht Club Games, "Story" (Mona), in Shovel Knight Showdown (version 4.1), Nintendo Switch