A friend who isn't really part of the group, but who you hang out with when the rest of the group is gone.

The next person in line that you ask to do something with after your preferred person isn't able to.

Haplessly taken for granted just because it’s not “exciting enough” or it’s “too good”. A plan that will only be referred to when all else fails. When you become a back up plan you should
figure out a way to hit them hard with the realization that you won’t always be there for them to walk all over you when they have no one else to go to; that you’ve got your own plans too. Otherwise, you my friend, will forever remain stuck in that phase.
Checkout doormat

Coming home from any vacation and keep on getting circular or very round bullets of shit until you have this massive motherload of a fuck come out and you have the squirts for the rest of the time. Most common in Disney Locations due to the massive sorts of food and re-used crap in the food and water.

an acquaintance that is only spoken to when all of one's real friends are absent.

There are usually "back-up channels" in which to people use in times when all other channels are on adverts. This saves people from being bored and changing activity to going outside or reading.

Person you invite to go somewhere when your preferred person cannot go. Can be male or female (non-gender specific).