Guy on Fortnite: "Ima sleep with your mom lmao."
Orphan: Starts crying.
Listen up, buttercup! The joke here is that the kid is an orphan, which means they don't HAVE a mom! So, when the Fortnite dude says he's gonna sleep with their mom, it's extra hurtful because it reminds the orphan that they ain't got no mama. It's dark humor, which you probably don't get because you're too busy eating paste.