What is Drop Dead?
1.
1) Phrase used to mean "I have no interest in listening to, speaking to, or being near you". Synonyms: "fuck off", "die".
2) To 'zone out' and lie immovable on the ground, often after consuming cannabis.
1) "So, you want to go for coffee some time?"
"Drop dead."
2) "Where's Mike?"
"He dropped dead on the grass outside. He's like a beached whale."
See