One nil 

Telling your friend to look at something that isn't actually there and then saying 'one nil'. This phrase is used because its like keeping score of how many times you've tricked eachother but without the score ever actually increasing.

Players will usually start safe and believable, but eventually make extravagant assumptions to make their friend look even more foolish for looking.

Antony: look at that huge spider!
Dan: *turns and looks*
Antony: one nil haha as if you actually looked, idiot!

One nil by P Boor September 9, 2013

one-nil 

A game that often escalates and quickly gets out of hand where an individual calls out to another and gets his attention for no reason, only to short one-nil at him. This game proceeds with the score increasing the more times the individual achieves this.

Twat: "Hey mate"
Mate: "Oh hiya, how are..."
Twat: "ONE-NIL!"

one-nil by GameStarter October 29, 2012

Onenil 

Means child predator

The guy is such a onenil.. he said 8 year olds are hot

Onenil by BobXDSud January 27, 2024

Onenil 

Something you say after making a joke. Meaning they just pranked you

Hey man I just won the lottery. Onenil you just got pranked

Onenil by BobXDSud February 3, 2024