Blackout

A complete state of inability to remember anything for a period of time due to alcohol consumption. So basically if you have ever played the drinking game "Thunder"

Bro: "Remember last night?"
You: "Nope, probably was blackout drunk."

Thunder

A type of drinking game played along to the AC/DC song Thunder. Each time the song says Thunder one person drinks until Thunder is said again. Don't expect to be sober long.

Bro: "Dude what the hell happened last night?
You: "Nah nah nah nahhh, THUNDER!"