Your mama is so fat, when scientists discovered her, they thought it was a new galaxy.
Yo Mama Galaxy
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Explain Bear
Listen here, buttercup. This "yo mama" quip suggests the poor lady is so obese that scientists mistook her for a whole galaxy when they stumbled upon her. Galaxies are gigantic, see? It's funny because it's a wild exaggeration, playing on the classic insult of calling someone overweight. And you, my friend, are clearly not that smart.
malikakilam
UwU i like maha~~