by smiley808 September 07, 2010
Megatron is the street name for the legal high mephedrone, it's sold in many herbal high shops under many different names i.e shake and vac.
Let's do some Megatron
by Frogbox September 03, 2009
by jay22567 December 29, 2005
An obese female, usually capable of consuming large amounts of "energon" such as chips, pizza, hamburgers, etc. in a single sitting. Megatrons tend to be rather obnoxious or loud, often being heard over most talk in a room.
"Bro, I was trapped behind this megatron at Wendy's. She was so loud, I couldn't hear anybody else in the room!"
by hurr durr herp derp January 05, 2012