Fainites 

1960s North London (UK) playground slang/shout used to opt out of a game temporarily, or to prevent yourself being tagged in a game. Often it is accompanied be crossing the fingers and the arms in front of your chest and standing still.

The call can also be used to suspend a whole game temporarily, for example when an adult walks across a football pitch

Said to be derived from the Old English "Fain would I..." or "I do not want to..."

"I was about to be tagged, but I shouted "fainites" so he went on and tagged someone else."

"I was just about to boot the ball when an old lady walked across the playground and someone shouted "fainites".

Fainites by Flemingovia September 1, 2008

Fanites 

To exclude one, or forbid other in action against you.

is usually accompanied by the 2 crossed index and middle fingers.

"you got the Lurgee!"

"!no!! fanites!"

Fanites by another mal February 3, 2008

Finitesimal

An indefinitely large quantity. The largest cardinal number. It is larger than every other finite number. A value closest to infinity but is not infinite.

Person 1: What's the smallest number you can think of?
Person 2: Infinitesimal
Person 3: What about the largest?
Person 2: That would be infinity.
Person 3: But infinity isn't a number.
Person 2: Perhaps, Finitesimal?
Person 1 & 3: That makes sense.

Finitesimal by BigMartin58 May 17, 2021