A slang term used to describe the act of self pleasure, often used by young males who have recently discovered the delights of the wrist manual or bongo mag.
Also, a dolphin named Flug.
"Shit, last night I cleaned the pipes summit chronic... I flug the dolphin everynight till my tally whacker is red raw!"
Alex, everyday at 2pm retires to the toilet for his afternoon hand shandy. he loves to flug the dolphin so much so that I'm worried for him loosing his sight and becoming a hunchback... the randy mofo!