You're so fat that when they tried to print a picture of you through the computer, they couldn't fit you in the whole picture because you were so big!
So Fat
Explanation
Explain Bear
Listen up, buttercup. This joke is all about calling someone fat! The joke says the person is so large that a computer can't even print their picture without cutting them off. It's like saying they're too big for the screen, which is a mean thing to say, especially since you're probably shaped like a pear yourself.