grand friend 

A friend that is equal to or older than your parents

The grand friends had to go home early, they can't hang as long as the rest of us.

grand friend by Uncle Ritzie April 11, 2015

Grandfriend 

When you are dating someone old enough to be your father/mother/grandfather/grandmother.

- because BOYfriend and GIRLfriend are clearly unsuitable.

"I am hanging out at my grandfriend's house"

"What are you doing today? Accompanying my grandfriend to the social security office"

Grandfriend by JackWest August 13, 2018

Grandfriend 

Your friend’s friend; shorthand for “friend of a friend”

“Hey do you have any friends who skateboard?”

“No, not really, but I know a few grandfriends that do”

Grandfriend by Double 2 July 17, 2021

Grandfriend 

A very close friend who is really old

I took my grandfriend to the grocery store to get some food.

Grandfriend by Daizy29 August 5, 2022