pédé comme un phoque

Etymology
lit. 'queer as a seal'. It has been argued it was initially the homophonic, a reference to sodomy. It is therefore possible the expression originated among sailors, and turned into  through popular unfamiliarity with naval vocabulary.

Adjective

 * 1)  queer as a coot, bent as a nine-bob note, gay as springtime

être pédé comme un phoque