This Mishnah will talk about a person who intends to do part of the service of a korban (offering) in an improper spot. Now, it's not supposed to be done or at an improper time.
The Mishnah says: If somebody slaughters a korban with the intention to throw the blood outside of the courtyard of the Beit HaMikdash, or even to throw a little bit of the blood outside of the courtyard of the Beit HaMikdash, or he slaughters the korban with the intention to burn the eimurim, the parts of the meat of the animal that is supposed to be burned on the Mizbeach (altar), to have those burned outside of the courtyard, or he slaughters it to have even part of the eimurim burned outside of the courtyard.
Le'echol basar bachutz or kezayit (olive-sized portion) mibesaro bachutz, or he slaughters it intending to eat some of the meat outside of the permitted area, or even a small kezayit part of the meat outside of the permitted area, or he wants to eat a kezayit of the animal hide of the sheep or the fat tail of the sheep or lamb outside of the permitted area. In all of these cases, the korban is invalid, and the meat is not allowed to be eaten even in the proper place, but there's no penalty of karet (excision) for eating the meat in this type of way.
The intention to throw, burn, or eat the meat outside of the permitted area invalidates the korban, and you're not allowed to eat the meat. But the penalty of karet would not apply in this type of situation, as opposed to what we're about to say, which is the intention about time. That's where karet starts to play in, and that's where we have something called pigul (invalid).
If he slaughters the korban with the intention to throw the blood on the Mizbeach on the next day, the improper day, or even to throw part of the blood on the Mizbeach on the next day, or he slaughters it intending to burn the eimurim the next day, or even to burn parts of the eimurim on the next day, or to eat the meat on the next day, or even to eat a kezayit of the meat on the next day, or to eat a kezayit of the hide of the skin of the fat tail on the next day, in all of these cases, the korban is pigul, invalid, and known as pigul.
The Mishnah, we're talking about korbanot here. They have to be eaten before dawn of the day after they're slaughtered—before dawn at that time. So therefore, if they're slaughtered with the intention of eating their meat the next day, that means after dawn of the next day, these korbanot are problematic and therefore are considered to be pigul, invalid, and a person is liable to the penalty of karet if he does eventually eat it, if he eats it even during the right time. Once he has the improper intention about time through his mindset and his thoughts about the korban, the meat becomes forbidden, and eating it is punishable, in this case by karet.