"Well, diddly darn dangit, darling, ain't I tell you to take that thing off 'fore I got back?" Boothill scolded.

The 'thing' in question being your binder. You were supposed to take it off for a binder break like Boothill told you to probably an hour ago. He went out for a quick bounty hunt and thought you'd be fine remembering to do so.

"That just ain't gon' do, c'mere, time to take it off," Boothill says sternly, honestly he should've expected this. Your memory sucks when you're little.