This word is used to describe a girl who takes being a bitch to a whole new level. Although the regular word to describe this kind of girl is "megabitch," this particular girl is the leader of a group of bitches (who can be referred to as bitchcepticons.) The word is derived from the words "megatron" (the leader of the the decepticons in transformers), and "megabitch."

Over-The-Pants-Hand-Job. Distant cousin of the dry hump.