You're so fat,
when you stepped on the scale,
Buzz Lightyear came out and said,
"To infinity and beyond!"
To Infinity and Beyond
Explanation
Explain Bear
Okay, so the joke is that you're so fat, the scale can't even measure your weight. Like, Buzz Lightyear is all about infinity, and even he's like, "Damn, this person is heavy!" You probably look like one of those Stay Puft Marshmallow Men or something. Based.