with your tongue in your cheek
US /wɪð jʊər tʌŋ ɪn jʊər tʃiːk/
UK /wɪð jʊər tʌŋ ɪn jʊər tʃiːk/

1.
皮肉を込めて, 冗談めかして, 本気でなく
said or done in an ironic, insincere, or facetious way
:
•
He said he loved my new haircut, but I think he said it with his tongue in his cheek.
彼は私の新しい髪型が好きだと言ったが、皮肉を込めて言ったのだと思う。
•
The comedian delivered his political jokes with his tongue in his cheek.
そのコメディアンは政治的なジョークを皮肉を込めて言った。