(noun) Term used among marijuana smokers describing a marijuana seed that was accidentally rolled into the joint or blunt or loaded into the pipe. When the cherry reaches the hippy bomb and heats it to a certain temperature, it "explodes" making a sharp snapping or popping sound that isn't very loud at all but is often quite startling while under the influence of pot, especially to the one smoking it at the time.
Stoner: Whoa, gotta watch out for those hippy bombs!
Me: So, how's it goin'?
You (in a chipper voice): Shitty!
Me: You sound awful content, all things considered.
You: Well, what else can you do?
Me: I guess you're right. When life gives you shit.... I guess make shitinade.