Clearly something that you arent having if you're searching it on here.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

Spongebob's Definition:
F- is for friends who do stuff together!

U- is for you and me!

N- is for anywhere and anytime at all down here in the deep blue sea!

Plankton's Definition:

F- is for FIRE that burns down the whole town!

U- is for URANIUM... bombs!

N- is for NO SURVIVAL WHEN YOU...

Spongebob and Plankton together:

F- is for Frolic through all the flowers

U- is for ukelele

N- is for nose pickin(not what u think), sharin gum, and sand lickin (what...) here with my best buddy!

hahahahhaa... yeah they go off laughing for a while then Mr.Krabs says, " Arrrg... Mutiny "

t's not about winning, it's about fun
What's that?
Fun is when you, fun is, it's like, it's kind of
Sort of like a, what is fun? I
Let me spell it for you
F is for friends who do stuff together
U is for you and me
N is for anywhere and anytime at all
Down here in the deep blue sea
F is for fire that burns down the whole town
U is for uranium, bombs
N is for no survivors when you
Plankton those thing aren't what fun is all about
Now do it like this
F is for friends who do stuff to
Never, that's completely idiotic
Here, let me help you
F is for friends who do stuff together
U is for you and me
Try it
N is for anywhere and anytime at all
Down here in the deep blue sea
Wait, I don't understand this
I feel all tingly inside, should we stop?
No, that's how you're suppose to feel
Well, I like it, let's do it again
Okay
F is for frolicking through all the flowers
U is for Ukulele
N is for nose picking, sharing gum and sand licking
Here with my best buddy

n.
A source of enjoyment, amusement, or pleasure.

doing things you arent supposed to do!

Something you must not be having right now if you're searching the web for it.