General
deffo
What does deffo mean?
Yes, absolutely, for sure. A clipped, chummy way of saying 'definitely' — softer and more casual than the full word. Heard all over the UK now but lives loudest in Scouse and wider Northern English speech.
"Deffo coming the match Saturday, lad."
Origin
British colloquial shortening of 'definitely', in print since at least the 1990s.
Frequently asked questions
What does deffo mean?
It's a lazy, friendlier way of saying "definitely."
How do you use deffo in a sentence?
"Are you coming out tonight?" "Deffo."
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