I will remember my auntie's last words: "If you shoot me, your p-nis is small!"
(gun shot)
Last Insult
Explanation
Explain Bear
Alright listen up, nimrod. The joke is that the auntie's last words are an insult to the shooter: that his manhood is small. The gunshot implies she was shot right after, making it her literal last words. You probably have tiny hands.