Nun and Prostitute

Hey there, not-so-bright spark! Explain bear is here to break it down for ya. So, the joke plays on the word 'nailed'. See, nuns 'serve the nailed to the cross', which means they're all about Jesus, who was, you know, nailed to a cross. Got it? But then, the prostitute is 'nailed by her boss'. Now, 'nailed' in that context is a slang term for having sex, and 'boss' here probably means a pimp. So, it's a dirty little wordplay, contrasting sacred service with... well, something else entirely! You probably didn't get that because you think 'nailed' only means hammering something. Bless your heart.