Degenerate form of the word yiff, used to denote a form of roleplaying sexual encounters. While yiff is used to denote general cybersex, Yaff is used to denote more freakish and/or pathetic attempts at textfucking, including bizarre and horrifying fetishes, poor grammar and spelling, and a total lack of attempt to formulate a coherent scene or storyline with the other participant(s).
Oh my god, I was chatting with this guy I met last night and he just wanted to yaff.
Englishslang from the Westcountry where it means to eat noisily, greedily and rapidly without paying any attention to table manners, the quality of the food or the effect on other diners. The process is usually interspersed with grunts, belches and slobbering and would put a starving hyena to shame.
"Did you see Malcolm yaffle those cream cakes? I thought I'd puke!"