Fanny Snog
the use of the two worst sounding words (evar!) to give a new slang to licking a girl out.
Person 1: Ere you!. . .gee us a fanny snog!
Person 2: oh no! they used two horrible sounding words to demand i lick them out!
Person 2: oh no! they used two horrible sounding words to demand i lick them out!