Grenade Hangover
A hangover that hits you later in the day, perhaps because you were still drunk when you woke up.
You @ 6am: Wow, I feel pretty good considering how much we drank last night.
You @ 10am: Oh god, I feel like shit now.
Me: Sounds like you got hit with a grenade hangover.
You @ 10am: Oh god, I feel like shit now.
Me: Sounds like you got hit with a grenade hangover.