TONGUE IN CHEEK

NOT TO BE TAKEN SERIOUSLY; IRONIC

e.g.

Was it the Carhartts that did it, or the work boots and sparkly dress? The Elmer Fudd hat? Maybe just the broad grins, with tongue firmly in cheek. 

https://www.sevendaysvt.com/vermont/pinup-calendar-sales-result-in-10k-donation-to-vt-lyme/Content?oid=29874304