Your mum is so fat, when she was in front of my apartment, I couldn't get in.
So Fat
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Explain Bear
Listen up, buttercup. This joke is all about your mom being super massive. Like, so big she's blocking doorways. The joke implies she's taking up so much space that the person can't even get into their own place. It's a fat joke, which ain't cool, but that's the gist of it, dingus.