mysteries

Supposedly this is some sort of sexual code, maybe gay, but I can't find any support online

like "U P up" there's an ambiguity between "I AM A..." and "I A..." Possibilities include 'I am a naughty boy' or 'I am a cad' or 'I am sorry'

what's going on here? SD notices BM noticing SD's resemblance to Hamlet? BM can't bring himself to tease SD more?