in your birthday suit
US /ɪn jʊər ˈbɜrθ.deɪ suːt/
UK /ɪn jʊər ˈbɜrθ.deɪ suːt/

1.
nu, em trajes de Adão
naked; without any clothes on
:
•
He was caught running around the garden in his birthday suit.
Ele foi pego correndo pelo jardim nu.
•
She felt embarrassed to be seen in her birthday suit.
Ela se sentiu envergonhada de ser vista nua.