give it the big one

present singular third person gives it the big one · participle present giving it the big one · past gave it the big one · participle past given it the big one · alternative give it the biggun

1. UKidiomaticslangTo behave in an arrogant or self-important manner; to boast.

   What I'm saying is, I don't want you to go away thinking, Sally Morgan's giving it the big one about how she spoke to the Princess of Wales every day.

   2008, Sally Morgan, My Psychic Life, London: Penguin Books, →ISBN, page 240

   2 more examples

   The only thing they never saw was the window going in and we didn't do that, just the looting. Anyway, this clever plod gives it the big one and tells the judge he saw us do it.

   2002, Andy Nicholls, Scally: Confessions of a Category C Football Hooligan, Ramsbottom: Milo, →ISBN, page 96

   I should have known when I developed my body parts in your womb and you kept me alive through that umbilical cord that you would be the one person who would know what's best for me. Instead I came sliding out of your vagina like Billy Big Balls, refusing breast milk, giving it the big one and I have been getting into trouble ever since.

   2015, Charlotte Crosby, Me Me Me, London: Headline Publishing Group, →ISBN, page 164