"M'colleague"
"M'colleague" is a phrase that Fry and Laurie began using during the fourth series to refer to each other. Both have since used this phrase outside the series to refer to the other, for example on chatshows, the dedication in Fry's novel The Stars' Tennis Balls which reads "To m'colleague", as well as the one in his second autobiography, The Fry Chronicles, which reads "To m'coll".
Read more about this topic: A Bit Of Fry & Laurie, Catchphrases