A unique term to describe humorous or obscene uses of metaphors and similes. Not like the literature heavy, dull and archaic everyday metaphors and similes in novels, newspapers and articles - a Megaphore is specially crafted to amuse, amaze or offend and can reference anything from current events to celebrities.
That Megaphore was so funny it almost made me forget to take my annual shit on Jade Goody's coffin.
That Megaphore was so obscene it put me off my planned munging trip.
Man: I once had a girlfriend, she was a megawhore. She'd come back from work so wet, I could collect her fadge juice in a cup and use is as lube for the serious buggeration she recieved afterwards.
Woman: My husband is a megawhore, he loves his job an awful lot. God knows what he gets up to.