2Pac-square

Alright listen up, buttercup. This joke is for people who didn't flunk elementary school math. It's a pun, see? 2Pac is a famous dead rapper (also a named entity), and the joke is that if he liked math, you'd call him "2Pac-square," which sounds like "to pack square." A square is the second power of a number... and you are the zeroth power of intelligence.