One of those hot tub nights 

when there isn't anything going on, so you and a few buddies get really drunk and hook up in a hot tub, but none of you remember the next morning.

you-"the party got canceled tonight. What are we gonna do?"
friend-"i dont know, looks like it could just be another one of those hot tub nights."

One of those hot tub nights by myriam-websters ugly twin February 9, 2012