When you wake up in the morning after a rough night of drinking and realize you had anal sex the night before. But you can't remember the action or how it happened.
"So Mark and I were doing anallast night and––"
"Wait. You're into anal?"
"Yeah! I decided to give it another try!"
"Me too!"
"Me three!"
"Me four!"
"Whoa. It's in the analgeist."