When you meet someone or have known someone for a while as friends, and randomly end up hooking up with them one night. However alcohol has to be involved in the hook-up process on both ends.
Ben- Brandon, I heard you had a fun time last night?
Brandon- What are you talking, I dont remember anything?
Ben- You had a Drahu with Brittney
Brandon- O Shit! Doesnt she have a boyfriend?
Ben- Let's hope she didnt remember either!