A person who is very proficient in the art of the deadly fart, it may be silent, it may be noisy, but one always knows for a fact that it will be stinky, it will clear the room, and sicken the occupants with it's ghastly odor, this term was coined by the fact that some of these odoious folk have actually cracked the skin around the butthole by releasing their poisonous gas.
A lucky nutcracker consisting in looking like you just hit your nuts really hard but you actually got penetrated in the butthole
“Bro I just got a super lucky ButtCracker!!!”
“Everyone thought my bits got wracked but the post actually went right up my crack, what a butt cracker!”
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.