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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
The guy is such a onenil.. he said 8 year olds are hot
Onenil by BobXDSud January 27, 2024
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