Flen flyys

Flen flyys is a poem, written in about 1475, that is chiefly famous for containing the first known written usage in English of the vulgar verb "fuck". In fact the usage was "fuccant", a hybrid of an English root with a Latin conjugation, and was disguised in the text by a simple code, in which each letter was replaced with the next letter in the alphabet (so that "fuccant" is written as "gxddbov").

Written half in English and half in Latin, the poem satirised Carmelite monks in the English county of Cambridgeshire. The poem takes its name from the opening line "Flen, flyys and freris" meaning "fleas, flies and friars".

The famous line reads "Non sunt in coeli, quia gxddbov xxkxzt pg ifmk." meaning "They [the friars] are not in heaven, since ..." followed by words that when decoded, taking in account the alphabet of the time (where u and v were interchangeable), read "fvccant vvivys of heli", a Latin/English mix that means "...they fuck the wives of Ely" (a town near Cambridge).

The poem also contains the lines "Fratres cum knyvys goth about and txxkxzv nfookt xxzxkt." With the last three words decoded in the same way as "suuiuyt mennis uuyuis", it may be translated as "Friars with knives go about and swive (have sex with) men's wives."