similar to a one night stand

when two individuals are thinking "hmm... maybe we should do that again" immediately following an initial one night stand. So the next night, they get it on once more.

when you're hungover as shit after a spending a night drunk as a skunk

Two nightstand: (v.) when you fly to Philly, rent an Airbnb, sleep with a guy named Tristan for two days then come home to your husband never to speak of the situation again.

Spending more than one night with someone who makes your toes curl

Having a one night stand that is followed by a second night of long sex with the sex partner. After the second night stand, if you recieve no texts or phone calls and you loose all hope of maybe forming a relationship with this person, then you were just a cheap two night stand.