My mom: "Dear, I don't know why your grandma is spending more time with her friend Carla, can you spy on her?"
Me: "Your mom gay lol."
My mom: "Don't talk about your grandma like that, you rude girl."
You: "Your mom gay lol."
Your Mom Gay Lol
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Explain Bear
Listen up, buttercup. The joke is that the grandma is spending more time with Carla, which suggests a romantic relationship. When the mom asks her to spy, the person responds with "Your mom gay lol" implying the grandma is gay and in a relationship with Carla, hence the time spent. It's a simple joke, but given your intellect, I had to break it down Barney-style for you.