A combonation of the
words "mega" and "retard". Often used as an insult whenever someone says
something very obvious or very stupid.
Can also refer to the combined forces or impact of
two or more annoying acquaintences.
"My friend just asked me what the difference is between third degree murder and third degree burns."
“I
don’t know why you hang out with that megatard
or:
"Oh no - Chris and Big
Andy are both coming to the party tonight.
Don't let them in the same room, or they'll form into MegaTard and we'll never get rid of them!"