Done and sassily self aware is how I’m interpreting this.
Snape: Ah, Mr. Potter… My newest… dark reminder… (continues taking attendance)
Dumbledore: And a fuckton of points for Gryffindor! Looks like we have a NEW house champ-
—
Snape: Look, Quirrel, let’s be straight. I know you’re trying to steal the damn stone and I am just so fucking tired of keeping Potter alive when you’re clearly out for his head-
Harry (from broom above): WHAT
Snape: (groans loudly as Quirrell bolts) Goddammit, Potter, I didn’t need this unexpected cardio.
Harry: I swear I just found Mrs. Norris like this! I didn’t do anything to her! I wouldn’t!
Dumbledore: Harry, of course-
Snape: (taking face out of hands) Why is it always you?
Lockhart: And here is my lovely assistant, Severus Snape! Of course, you’ll get your potions professor back in one piece when I’m done with him! (laughs)
Snape: Your unlikely descendents would feel how hard I’m going to curse you if I believed you capable of fathering a child.
Lockhart: It’s VALENTINE’S DAY BITCHES! Get in the spirit! Ask Professor Snape to teach you about love… potions!
Snape: (walks across Great Hall)
Snape: (walks out of Hogwarts)
Snape: (walks across Scotland)
Snape: (walks into the sea)
Snape: You’re not hiring a fucking werewolf.
Dumbledore: But who would know better how to fend off Sirius Black than his former be-
Snape: (flatly) -b-b-b-bitch?
Snape: Draco is fine, probably.
Draco: (obviously bleeding from reopened wound from Buckbeak) ?!
Snape: Oh, fine, but I’m getting tired of escorting you to the Hospital Wing for self-inflicted wounds.
Snape (waking up from being stunned by all Gryffindors present he was trying to save): Well, fine, then. (rolls over)
Dumbledore: And that’s it! That’s all our champions- oh, er, except for… (reads) Harry Potter?
Harry: I didn’t put my name in the goblet, I swear!
Snape: You never seem to do anything and yet
Snape: Yes, well, I am not going to sit here and break my honestly kind of obsessive promise for the sake of a death game. Does that really seem in character to you?
(cheating is against the rules, not the magical contract of the goblet - see: all the fucking cheating)
Umbridge: Hem, hem, Professor Snape, might I suggest some changes to your curriculum?
Snape: I don’t have the energy to hate you on top of all my other least favorite people.
Firenze: I hope we might be friendly, if not friends, as fellow professors, Severus Snape.
Snape: (shakes hand) I don’t even care anymore.
Dumbledore: So, you see, Severus, it really must be you that kills me to cement your place in Voldemort’s ranks and defuse this deathly hallow I’ve been carrying around.
Snape: (looks upward for patience) Why don’t you kill yourself if you want to die so badly?
Dumbledore: …Actually that’s not a half bad idea for neutralizing the elder wand.
Voldemort: Severus, are you… still loyal?
Harry: Oh, no, you’re dying! Professor, how can I-
Snape: Your eyes are… really poking my emotional wounds
Snape (in the afterlife): Thank Merlin that’s over.
Dumbledore: Have you ever heard of guardian spirits, my boy?
Snape: (covers face with hands and takes a sharp inward breath) I can never just be fucking done