Hearing Jack Black's character defend his young pupils in their school of rock was rather cringey for him using that word to say he'd touched them (not literally) and vice versa.
The reaction of the parents to his perceived paedophilia and grossness was funny, yet understandable. Maybe he should've used another word.
But that was the whole joke: "and I think I've touched every one of them" [bizarrely odd smile]. Cue the shocked look of horror on the parent's face. It's only funny because we saw how Dewey interacted with the kids and never did anything remotely inappropriate with them (sexually at least - scholastically is a different issue).
I thought it was a great gag.