"Who cracked anyway?" I don't know what crack exactly means in this.
Lynette: Oh, didn't have a good time?
Tom: "Okay. You know, drop the act! I know you gave them cookies."
Lynette: "Oh! Who cracked, anyway?"
-> "Who 'cracked' anyway?"
I guess this means that Porter was the noisiest kid in Tom's mind.
How about that? Tell me more specifically please :D