'tongue-in-cheek' definitions:

adverb

In a bantering fashion; "he spoke to her banteringly" [syn: banteringly, tongue-in-cheek]

adverb

Not seriously; "I meant it facetiously" [syn: facetiously, jokingly, tongue-in-cheek]

adjective

Cleverly amusing in tone; "a bantering tone"; "facetious remarks"; "tongue-in-cheek advice" [syn: bantering, facetious, tongue-in-cheek]