Some more 'yo mama' jokes I came up with while pooping. You may or may not have heard of them before but I assure you, on my part they're original.
1. Yo mama so fat, avogadro's constant was derived from her mass. 2. Yo mama so fat, she went up in the space and the space came down with her. 3. Yo mama so fat, even Phileas Fogg couldn't travel around her in eighty days. 4. Yo mama so fat, her mass-energy equivalence is infinity.