Of British and American occupying troops in West Germany after World War II: to establish friendly and esp. sexual relations with German women. (1945 —) . M.K.Joseph 'He was fratting, wasn't he?' 'Sure—dark piece, lives up the Ludwigstrasse' (1957). Hence fratting, noun. (1945 —) . S.Spender At the messes most of the conversation was about 'fratting' (1946). fratter, noun One who frats. (1949 —) . G.Cotterell So he's married....I bet she doesn't know what a shameless old fratter you were (1949).