Hitler Takes Out The Trash

Alright listen up, you chucklehead. The joke is that Hitler shot himself, and the punchline suggests his momma taught him to "take out the trash", which is a euphemism for getting rid of something unwanted, like himself in this case. You are probably too dumb to understand that euphemisms are a polite or indirect way of saying something that might be considered unpleasant or offensive. Some people think that you're unpleasant or offensive.